Journal of Pathology and Translational Medicine

Original Articles

Cytological Features That Differentiate Follicular Neoplasm from Mimicking Lesions: Kanghee Han, Hwa-Jeong Ha, Joon Seog Kong, Jung-Soon Kim, Jae Kyung Myung, Jae Soo Koh, Sunhoo Park, Myung-Soon Shin, Woo-Tack Song, Hye Sil Seol, Seung-Sook Lee; J Pathol Transl Med. 2018;52(2):110-120. Published online January 29, 2018; DOI: https://doi.org/10.4132/jptm.2018.01.17

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Background
It is difficult to correctly diagnose follicular neoplasms (FNs) on fine-needle aspiration cytology (FNAC) because it shares many cytological features with other mimicking lesions. The aim of this study was to identify the cytological features that differentiate FNs from mimicking lesions.
Methods
We included the cytological slides from 116 cases of thyroid FN diagnosed on FNAC, and included their subsequent histological diagnoses. We evaluated the cytological architectural pattern and nuclear features of the lesions according to their histological groups.
Results
The final histological diagnoses of the 116 cases varied, and included 51 FNs (44%), 47 papillary thyroid carcinomas (40%) including follicular variant, and seventeen cellular nodular hyperplasias (15%). Regardless of the final histological diagnosis, microfollicular pattern was observed in most cases. On the other hand, trabecular pattern was identified in 34% of FNs, but not in any other lesions. Additionally, elongated nuclei and ground glass chromatin were found in only some papillary thyroid carcinomas.
Conclusions
This study shows that the trabecular pattern is a representative cytological feature of FNs that can be used to distinguish FNs from mimicking lesions. In addition, nuclear shape and chromatin pattern can be used to further confirm the diagnosis of FNs from mimicking lesions through FNAC.

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АКТУАЛЬНІ ТЕНДЕНЦІЇ ДІАГНОСТИКИ ТА ЛІКУВАННЯ ФОЛІКУЛЯРНИХ НЕОПЛАЗІЙ ЩИТОПОДІБНОЇ ЗАЛОЗИ
А. Я. Пасько, В. Д. Скрипко
Art of Medicine.2025; : 82. CrossRef
Diagnostic implication of thyroid spherules for cytological diagnosis of thyroid nodules
Heeseung Sohn, Kennichi Kakudo, Chan Kwon Jung
Cytopathology.2024; 35(3): 383. CrossRef
Fine needle aspiration cytology diagnoses of follicular thyroid carcinoma: results from a multicenter study in Asia
Hee Young Na, Miyoko Higuchi, Shinya Satoh, Kaori Kameyama, Chan Kwon Jung, Su-Jin Shin, Shipra Agarwal, Jen-Fan Hang, Yun Zhu, Zhiyan Liu, Andrey Bychkov, Kennichi Kakudo, So Yeon Park
Journal of Pathology and Translational Medicine.2024; 58(6): 331. CrossRef
Using Deep Convolutional Neural Networks for Enhanced Ultrasonographic Image Diagnosis of Differentiated Thyroid Cancer
Wai-Kin Chan, Jui-Hung Sun, Miaw-Jene Liou, Yan-Rong Li, Wei-Yu Chou, Feng-Hsuan Liu, Szu-Tah Chen, Syu-Jyun Peng
Biomedicines.2021; 9(12): 1771. CrossRef
The Role of Fine Needle Aspiration Biopsy with Bethesda System in the Evaluation of Thyroid Nodules
Gizem AKKAŞ AKGÜN, Figen ASLAN
Anadolu Kliniği Tıp Bilimleri Dergisi.2021; 26(1): 23. CrossRef
Comprehensive DNA Methylation Profiling Identifies Novel Diagnostic Biomarkers for Thyroid Cancer
Jong-Lyul Park, Sora Jeon, Eun-Hye Seo, Dong Hyuck Bae, Young Mun Jeong, Yourha Kim, Ja Seong Bae, Seon-Kyu Kim, Chan Kwon Jung, Yong Sung Kim
Thyroid.2020; 30(2): 192. CrossRef
Preoperative diagnostic categories of fine needle aspiration cytology for histologically proven thyroid follicular adenoma and carcinoma, and Hurthle cell adenoma and carcinoma: Analysis of cause of under- or misdiagnoses
Hee Young Na, Jae Hoon Moon, June Young Choi, Hyeong Won Yu, Woo-Jin Jeong, Yeo Koon Kim, Ji-Young Choe, So Yeon Park, Paula Soares
PLOS ONE.2020; 15(11): e0241597. CrossRef

Importance of Individual Ghost Cells in Fine-Needle Aspiration Cytology Diagnosis of Pilomatricoma: Kanghee Han, Hwa-Jeong Ha, Joon Seog Kong, Jae Kyung Myung, Sunhoo Park, Jung-Soon Kim, Myung-Soon Shin, Hye Sil Seol, Jae Soo Koh, Seung-Sook Lee; J Pathol Transl Med. 2018;52(1):45-50. Published online January 15, 2018; DOI: https://doi.org/10.4132/jptm.2017.10.18

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Abstract PDF

Background
Although histological diagnosis of pilomatricoma is not difficult because of its unique histological features, cytological diagnosis through fine-needle aspiration cytology (FNAC) is often problematic due to misdiagnoses as malignancy.
Methods
We reviewed the cytological features of 14 cases of histologically-proven pilomatricoma from Korea Cancer Center Hospital, with a discussion on the diagnostic pitfalls of FNAC.
Results
Among 14 cases of pilomatricoma, 10 (71.4%) were correctly diagnosed through FNAC, and two (14.3%) were misdiagnosed as carcinoma. Cytologically, all cases had easily recognizable clusters of basaloid cells and foreign body-type multinucleated cells. Although ghost cells were also found in all cases, some were inconspicuous and hardly recognizable due to their small numbers.
Conclusions
An accurate diagnosis of pilomatricoma in FNAC is feasible with consideration of clinical information and close examination of ghost cells.

Citations

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Eyelid Pilomatrixomas: A Case Report and Comprehensive Literature Review
Georgia L Schafer, Krista Thompson, Katie Topping
Cureus.2025;[Epub] CrossRef
Caracterización epidemiológica e histopatológica del pilomatrixoma en un centro dermatológico en Bogotá
Manuela Vargas-Osorno, Jesús Daniel Fierro-Lozada, Yensi Lorena Romero-Díaz, Isabella Lozano-Mora, David Alfredo Castillo-Molina, Samuel David Morales-Naranjo
Piel.2025; 40(10): 633. CrossRef
A case of pilomatricoma with suspected malignancy diagnosed by intraoperative rapid cytological diagnosis
Miho YOSHIDA-TANAKA, Kazuya KURAOKA, Naoko YASUMURA, Arisa KAN, Yumi SAIKI, Akihiro KAGAWA, Akihisa SAITO, Kiyomi TANIYAMA
The Journal of the Japanese Society of Clinical Cytology.2019; 58(3): 133. CrossRef

The Significance of TROP2 Expression in Predicting BRAF Mutations in Papillary Thyroid Carcinoma: Joon Seog Kong, Hyeon Jin Kim, Min-Jung Kim, Areumnuri Kim, Dalnim Lee, Kanghee Han, Sunhoo Park, Jae Soo Koh, Jae Kyung Myung; J Pathol Transl Med. 2018;52(1):14-20. Published online December 11, 2017; DOI: https://doi.org/10.4132/jptm.2017.10.17

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Abstract PDF

Background
Trophoblast antigen 2 (TROP2) is a human trophoblast cell-surface glycoprotein that is overexpressed in several types of epithelial cancers, and is suggested to be associated with an unfavorable prognosis. BRAF mutations are the most common genetic alteration in papillary thyroid carcinoma (PTC). We evaluated the correlation between TROP2 expression and BRAF mutation in PTC.
Methods
First, we carried out pyrosequencing for BRAF mutations and immunohistochemistry for TROP2 expression with a tissue microarray consisting of 52 PTC cases. Membranous staining in at least 5% of tumor cells was designated as positive staining and we analyzed the relationship between TROP2 expression and diverse clinicopathological factors, including BRAF mutation. Second, we tested TROP2 mRNA expression in three thyroid cancer cell lines with BRAF mutations (BCPAP, SNU790, and 8505C) and a normal thyroid cell line. Additionally, we checked TROP2 protein levels in a normal thyroid cell line after introduction of the BRAF V600E mutation.
Results
In this study, 21 of 26 cases with BRAF mutation showed TROP2 immunoreactivity, whereas all 26 cases without BRAF mutation showed no immunoreactivity for TROP2 with a statistically significant difference (p<.001). Upregulation of TROP2 mRNA was observed in all three thyroid cancer cell lines, but not in the normal thyroid cell line. Interestingly, however, the TROP2 expression was increased in the normal thyroid cell line after introduction of the BRAF V600E mutation.
Conclusions
Based on these results, we concluded that TROP2 expression is significantly associated with BRAF mutation and that TROP2 immunohistochemistry could be used for predicting BRAF mutations or diagnosing papillary thyroid carcinoma.

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Trop2-Targeted [18F]AlF-RESCA-RT4 ImmunoPET/CT in Guiding Clinical Surgeries of Thyroid Cancers: A Proof-of-Concept Study
Xinlu Yin, Wenzhi Jia, Le Xu, Wenjie Zheng, Yiqing Gao, Linglin Tang, You Zhang, Qianyun Wu, Dongsheng Xu, Shuxian An, Weijun Wei, Jianjun Liu, Qinyi Zhou, Jialin Feng, Jun Chen
Molecular Pharmaceutics.2026;[Epub] CrossRef
Evolution of TROP2: Biological insights and clinical applications
Xinyue Zhang, Hong Xiao, Fangjian Na, Jingqi Sun, Qi Guan, Ruotong Liu, Lutong Cai, Heming Li, Mingfang Zhao
European Journal of Medicinal Chemistry.2025; 296: 117863. CrossRef
Diagnostic and prognostic utility of TROP-2, SLP-2, and CXCL12 expression in papillary thyroid carcinoma
Amany Selim Attia, Samia Hussein, Hend Sameh, Amr Khalil, Ahmad Barakat Waley, Ihab Matar, Reham Sameh
Cancer Biomarkers.2024; 39(3): 211. CrossRef
BRAF mutation, selected miRNAs and genes expression in primary papillary thyroid carcinomas and local lymph node metastases
David Kalfert, Marie Ludvikova, Martin Pesta, Tommi Hakala, Lucie Dostalova, Hana Grundmannova, Jindra Windrichova, Katerina Houfkova, Tereza Knizkova, Jaroslav Ludvik, Jiri Polivka, Ivana Kholova
Pathology - Research and Practice.2024; 258: 155319. CrossRef
Unveiling the placental secrets: Exploring histopathological changes and TROP2 expression in intrahepatic cholestasis of pregnancy
Cezmi Baran Ozalp, Sozdar Akdogan, Dilan Cetinavci, Melike Nur Akin, Hulya Elbe, Burcu Kasap
Placenta.2024; 154: 201. CrossRef
Trop2-Targeted Molecular Imaging in Solid Tumors: Current Advances and Future Outlook
Yongshun Liu, Wenpeng Huang, Rachel J. Saladin, Jessica C. Hsu, Weibo Cai, Lei Kang
Molecular Pharmaceutics.2024; 21(12): 5909. CrossRef
TROP2 is a Good Indicator for Infiltrative Nature of Carcinoma Rather than Diagnosing Malignancy in Thyroid
E. Kılınc, P. Gunes, A. Doganer
Indian Journal of Otolaryngology and Head & Neck Surgery.2022; 74(S2): 2560. CrossRef
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Xinlin Liu, Junwen Deng, Yang Yuan, Wujun Chen, Wenshe Sun, Yanhong Wang, Haiming Huang, Bing Liang, Tao Ming, Jialian Wen, Binghuan Huang, Dongming Xing
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Knockdown of Trop2 inhibits proliferation and migration and induces apoptosis of endometrial cancer cells via AKT/β‐catenin pathway
Xiaotong Sun, Guangyang Xing, Cui Zhang, Kun Lu, Yuqiong Wang, Xiyan He
Cell Biochemistry and Function.2020; 38(2): 141. CrossRef
Can TROP2 be used as a prognostic marker in endometrioid endometrial carcinoma?
SerkanY Celik, Özgürİlhan Çelik
Indian Journal of Pathology and Microbiology.2020; 63(3): 418. CrossRef
Diagnostic Value of TROP-2 and CK19 Expression in Papillary Thyroid Carcinoma in Both Surgical and Cytological Specimens
Asmaa Gaber Abdou, Mohammed Shabaan, Rania Abdallha, Nehal Nabil
Clinical Pathology.2019;[Epub] CrossRef
Evaluation of Diagnostic Utility of Immunohistochemistry Markers of TROP-2 and HBME-1 in the Diagnosis of Thyroid Carcinoma
Nooshin Zargari, Maral Mokhtari
European Thyroid Journal.2019; 8(1): 1. CrossRef
The diagnostic value of TROP-2, SLP-2 and CD56 expression in papillary thyroid carcinoma
Xueyang Yang, Yifang Hu, He Shi, Chengzhou Zhang, Zhixiao Wang, Xiaoyun Liu, Huanhuan Chen, Lijuan Zhang, Dai Cui
European Archives of Oto-Rhino-Laryngology.2018; 275(8): 2127. CrossRef
TROP2 promotes cell proliferation and migration in osteosarcoma through PI3K/AKT signaling
Qing‑Zhi Gu, Abulimiti Nijiati, Xing Gao, Kai‑Liang Tao, Cheng‑Duo Li, Xue‑Peng Fan, Zheng Tian
Molecular Medicine Reports.2018;[Epub] CrossRef

Fine Needle Aspiration Cytology of Parathyroid Lesions: Ilyeong Heo, Sunhoo Park, Chang Won Jung, Jae Soo Koh, Seung-Sook Lee, Hyesil Seol, Hee Seung Choi, Soo Youn Cho; Korean J Pathol. 2013;47(5):466-471. Published online October 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.5.466

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Abstract PDF

Background

There has been an increase in the use of fine needle aspiration cytology (FNAC) for the diagnosis of parathyroid lesions (PLs). Differentiation between a thyroid lesion and a PL is not easy because of their similar features. We reviewed parathyroid aspirates in our institution and aimed to uncover trends in diagnostic criteria.

Methods

We selected 25 parathyroid aspirates (from 6 men and 19 women) confirmed surgically or immunohistochemically from 2006 to 2011.

Results

Major architectural findings of PLs include scattered naked nuclei, loose clusters, a papillary pattern with a fibrovascular core, tight clusters, and a follicular pattern. These architectures were commonly admixed with one another. Cytological features included anisokaryosis, stippled chromatin, a well-defined cell border, and oxyphilic cytoplasm. Eighteen of the 25 patients were diagnosed with PL using FNAC. Seven patients had been misdiagnosed with atypical cells (n=2), benign follicular cells (n=2), adenomatous goiter (n=2) and metastatic carcinoma (n=1) in FNAC. Using clinicoradiologic data, the sensitivity of the cytological diagnosis was 86.7%. The cytological sensitivity decreased to 50% without this information.

Conclusions

FNAC of PL is easily confused with thyroid lesions. A combination of cytological parameters and clinical data will be required to improve the diagnostic sensitivity of PLs.

Citations

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Fine-Needle Aspiration Cytology of Pleomorphic Carcinomas of the Lung: Hee Seung Choi, Hyesil Seol, Il Yeong Heo, Chang Won Jung, Soo Youn Cho, Sunhoo Park, Jae Soo Koh, Seung-Sook Lee; Korean J Pathol. 2012;46(6):576-582. Published online December 26, 2012; DOI: https://doi.org/10.4132/KoreanJPathol.2012.46.6.576

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Abstract PDF

Background

Pleomorphic carcinoma (PC) is a rare pulmonary malignancy. Because of its rarity and histological heterogeneity, cytopathologists might suspect PC only rarely on the basis of its cytological specimen. In addition, cytological findings from fine needle aspiration (FNA) specimens have rarely been described. Hence, we investigated the cytological features of FNA in the cases of PC.

Methods

We reviewed 7 FNA specimens of PC. The patients had undergone surgical resection at the Korea Cancer Center Hospital between 2007 and 2011. The cytological features of PC were assessed and compared with the histopathological features of the corresponding surgical specimen. Immunocytochemical analysis with cytokeratin and vimentin was performed on the cell blocks.

Results

The tumor cells were either dispersed or arranged in loose aggregates, and generally lacked any glandular or squamous differentiation. Pleomorphic or spindle shape tumor cells were observed, and mono-, bi-, or multi-nucleated giant cells were frequently observed. The background showed necrosis and contained numerous lymphocytes and neutrophils. Immunocytochemically, the tumor cells were positive for cytokeratin and vimentin.

Conclusions

PC displays characteristic cytological features. It might therefore be possible to make an accurate diagnosis of PC by assessing the degree of nuclear atypia.

Citations

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Sarcomatoid carcinoma in cytology: Report of a rare entity presenting in pleural and pericardial fluid preparations
Atreyee Basu, Andre L. Moreira, Anthony Simms, Tamar C. Brandler
Diagnostic Cytopathology.2019; 47(8): 813. CrossRef
Cytological Evaluation of Pleomorphic Carcinoma of the Lung
Kevin Kuan, Samer N. Khader, Siba El Hussein
Diagnostic Cytopathology.2019; 47(9): 961. CrossRef
Combined small cell carcinoma with giant cell carcinoma component of the lung: A case successfully diagnosed by computed tomography‑guided fine‑needle aspiration cytology
Yusuke Ebisu, Mitsuaki Ishida, Tomohito Saito, Tomohiro Murakawa, Yoshiko Uemura, Koji Tsuta
Oncology Letters.2017;[Epub] CrossRef
Pulmonary Pleomorphic Carcinoma Detected as a Result of Pneumothorax and the Subsequent Occurrence of Multiple Cystic Metastases
Hideaki Yamakawa, Masahiro Yoshida, Masami Yabe, Yuri Baba, Emiri Baba, Hiroaki Katagi, Takeo Ishikawa, Masamichi Takagi, Takeo Nakada, Tadashi Akiba, Kazuyoshi Kuwano
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Pulmonary pleomorphic carcinoma with multiple metastases to the right posterior knee complicated by paraneoplastic hypercalcemia
PENG-FEI LI, CHENG-HSIANG LO, SHAN-HAN YANG, PING-YING CHUNG, CHING-LIANG HO
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Case Report

Primary Monophasic Synovial Sarcoma Arising in the Mesentery: Case Report of an Extremely Rare Mesenteric Sarcoma Confirmed by Molecular Detection of a SYT-SSX2 Fusion Transcript: Han Suk Ryu, Ilyeong Heo, Jae Soo Koh, Sung-Ho Jin, Hye Jin Kang, Soo Youn Cho; Korean J Pathol. 2012;46(2):187-191. Published online April 25, 2012; DOI: https://doi.org/10.4132/KoreanJPathol.2012.46.2.187

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Abstract PDF

Synovial sarcoma arises in the para-articular tissues, and it can also occur in various unexpected sites. We report a rare case of primary monophasic synovial sarcoma (MSS) arising in the mesentery. A 59-year-old man presented with a palpable abdominal mass. On microscopic examination, the entire tumor comprised a dense proliferation of the spindle cells without epithelial components. The tumor cells were positive for transducin-like enhancer of split 1, bcl-2, epithelial membrane antigen and CD99 but negative for CD34, CD117, alpha-smooth muscle actin, cytokeratin, and calretinin on immunohistochemistry. The reverse transcriptase-polymerase chain reaction revealed a single 151-bp fragment representing the SYT-SSX2 fusion transcript. Because mesenteric MSS is extremely rare and many cases display histologic findings that overlap with those of more frequently involved tumors such as hemangiopericytoma and gastrointestinal stromal tumor, there is a chance of making an incorrect diagnosis that can result in an inappropriate treatment.

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International Journal of Surgery Case Reports.2020; 77(D): S52. CrossRef
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Thibault Kervarrec, Claire Lecointre, Rémy Kerdraon, Guido Bens, Arnaud Piquard, Patrick Michenet
Annales de Pathologie.2015; 35(6): 506. CrossRef

Original Article

Lyn Expression in Osteoblastic Osteosarcoma Tissues and Its Correlation with Clinicopathologic Factors.: Min Sun Jin, Shin Kwang Khang, Min Suk Kim, Hee Seung Choi, Jung Eun Lee, Kil Ho Kim, Dae Geun Jeon, Jae Soo Koh; Korean J Pathol. 2010;44(2):125-131.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.2.125

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Abstract PDF

BACKGROUND
The Src family kinases (SFKs) are involved in multiple aspects of tumorigenesis, such as, proliferation, migration, and angiogenesis, and are involved in the generation and progression of many types of tumors. Furthermore, dasatinib, a general SFKs inhibitor was recently approved for use in chronic myeloid leukemia. This study was performed to evaluate the expression of Lyn, a member of the SFKs, in osteosarcoma tissues.
METHODS
One hundred and sixteen patients with osteoblastic osteosarcoma were selected for Lyn expression analysis. The correlation between Lyn expression in tumor sections and patients' clinicopathologic characteristics and the prognostic significance of Lyn expression were evaluated.
RESULTS
Lyn was found to be expressed in 52 of the 116 patients (44.8%), and Lyn positive tumor was found to be significantly associated with a lytic tumor pattern on plain radiographs (p = 0.04). Furthermore, those positive for Lyn showed longer metastasis free survival (5-year metastasis free survival, 65.2% for Lyn positive and 46.8% for Lyn negative; p = 0.06), though this was only marginally significant.
CONCLUSIONS
Lyn was found to be overexpressed in osteosarcoma tissues, and this overexpression was found to be correlated with osteolysis.

Citations

Citations to this article as recorded by

Eight Aging-Related Genes Prognostic Signature for Cervical Cancer
Meilin Yin, Yanhua Weng, Ferenc Olasz
International Journal of Genomics.2023; 2023: 1. CrossRef
LYN expression predicts the response to dasatinib in a subpopulation of lung adenocarcinoma patients
Yu Jin Kim, Sungyoul Hong, Minjung Sung, Min Jeong Park, Kyungsoo Jung, Ka-Won Noh, Doo-Yi Oh, Mi-Sook Lee, Ensel Oh, Young Kee Shin, Yoon-La Choi
Oncotarget.2016; 7(50): 82876. CrossRef

Case Report

Fine Needle Aspiration Cytologic Features of Well-Differentiated Papillary Mesothelioma in the Pleura: A Case Report.: Han Suk Ryu, Min Sun Jin, Hee Seung Choi, HeeJong Baek, Jae Soo Koh; Korean J Pathol. 2009;43(6):583-588.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.6.583

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Abstract PDF

Well-differentiated papillary mesothelioma (WDPM) is a rare subtype of malignant mesothelioma, which is considered to have low malignant potential. Because of its rare occurrence in the pleura, cytopathologists are not familiar with the cytologic features of WDPM, and to date only one report regarding the cytomorphology of aspiration biopsies of WDPM in pleura has been released. The authors present the findings of fine needle aspiration cytology of WDPM in the pleura in a 53-year-old woman. Aspiration smears showed papillary clusters composed of one to three layers of surface tumor cells and a central hyalinized stromal core. Tumor cells were round, ovoid, and spindle like with minimally atypical nuclei and small conspicuous nucleoli. Mitotic activity was virtually absent. Excisional biopsy histologic and immunohistochemical findings were wholly compatible with WDPM findings. Knowledge of the specific cytologic findings of WDPM is crucial for accurate diagnosis and appropriate treatment.

Citations

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Well-Differentiated Papillary Mesothelioma of the Peritoneum
Jitendra G. Nasit, Gauravi Dhruva
American Journal of Clinical Pathology.2014; 142(2): 233. CrossRef

Review

Fine Needle Aspiration Cytologic Findings of Pulmonary Neuroendocrine Tumors.: Jae Soo Koh; J Pathol Transl Med. 2008;19(1):9-15.; DOI: https://doi.org/10.3338/kjc.2008.19.1.9

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Abstract PDF: The major categories of neuroendocrine tumors of lung are typical carcinoid, atypical carcinoid, large cell neuroendocrine carcinoma, and small cell carcinoma. The histologic classification criteria of neuroendocrine tumors are well documented in the "WHO Classification of Tumors" based on mitotic figures and necrosis. Cytologic characteristics of neuroendocrine tumors are trabecular, acinar, and solid arrangement of tumor cells and occasional rosette formation. Nuclear chromatin patterns are characteristically described as "salt and pepper chromatin pattern". Many of cytologic classifications documented in the literature are before the "WHO Classification". In this review, the cytologic features of pulmonary neuroendocrine tumors are documented according to the WHO classification, and recent concepts of neuroendocrine tumors of lung are discussed.

Original Article

Comparison of Qualified Diagnosis of "Atypical Squamous Cells of Undetermined Significance" with Subsequent Biopsy .: Jae Soo Koh, Jin Haeng Chung, Seung Sook Lee, Kyung Ja Cho; J Pathol Transl Med. 1999;10(1):1-5.

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Abstract PDF: To evaluate whether different qualifications of a cytologic diagnosis of "atypical squamous cells of undetermined significance(ASCUS)" predict a greater or lesser likelihood of tissue diagnosis of uterine cervix, we compared different cytologic qualifications of ASCUS with the tissue diagnosis. One hundred twenty-two con secutive Papanicolaou smears showing ASCUS in women who had undergone cervical biopsy within nearest 30 days were collected. The 122 smears were qualified as "favor reactive"(25%), "favor low grade squamous intraepithelial lesion (LSIL)"(24%), "favor squamous intraepithelial lesion(SIL)"(16%), "favor high grade squa mous intraepithelial lesion(HSIL)"(16%), and "not otherwise specified"(19%). Squamous intraepithelial or invasive lesion was pathologically confirmed by cervical biopsy in 13% of the "favor reactive", 27% in "favor LSIL", 70% in "favor SIL", 75% in "favor HSIL", and 35% in "not otherwise specified" smears. There were significant asso ciations between the favor reactive smear and the benign biopsy finding and between the favor SIL smear and the biopsy showing a squamous intraepithelial or more severe lesion. Nevertheless, most of favor LSIL smears exhibit reactive process in tissue biopsy. Conclusively, qualified ASCUS stratifies women into different risk groups for SIL. The cytopathologist should make the cytologic diagnosis of "ASCUS, favor LSIL" circumspectly.

Case Report

Intraductal Cystic Hypersecretory Carcinoma of the Breast: A case report.: Jin Haeng Chung, Seung Sook Lee, Jae Soo Koh, Kyung Ja Cho, Jong Inn Lee; Korean J Pathol. 1999;33(2):137-140.

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Abstract: The cystic hypersecretory duct carcinoma of the breast was first described in 1984 by Rosen and Scott and warrants separate discussion because of its unusual pathological features. It is morphologically distinguishable from juvenile (secretory) carcinoma and from mucinous (colloid) carcinoma or mucocele-like tumor. We present a case report of intraductal cystic hypersecretory carcinoma of the breast with hormone receptor and oncogene study. The histologic differential diagnosis, with an emphasis on benign lesions that may have a predominant cystic component, is also discussed.

Original Article

Analytic study of 362 bile cytologic materials.: Jae Soo Koh, Chang Won Ha, Na Hye Myong, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1991;2(2):73-78.

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Abstract PDF: No abstract available.

Case Report

Coexisting Adenocarcinoma and Epithelioid Leiomyosarcoma of Stomach: A case report.: Jung Youn Kim, Jae Soo Koh, Kyung Ja Cho, Ja June Jang; Korean J Pathol. 1995;29(4):521-523.

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Abstract PDF: We report a case of malignant tumor of the stomach showing both carcinoma and sarcoma components in a 47 year-old woman. The resected stomach revealed two tumors which were in different location. The one mass was a 2 x I cm, poorly demarcated tumor at the body, along the lesser curvature and the other was a 6 x 7 cm, well demarcated polypoid tumor with a central depression at cardia of the posterior stomach wall. The tumor at the body was a poorly differentiated adenocarcinoma which showed strong reactivity for CEA. The tumor at the cardia was composed of epithelioid or spindle shaped cells with abundant eosinophilic cytoplasm and revealed 5-6 mitoses per ten high power field. The tumor at the cardia was diagnosed as epithelioid leiomyosarcoma and showed reactivity for vimentin but none for actin, desmin,keratin, and CEA. This is different from the usual carcinosarcoma.

Original Article

Background cytologic features of metastatic carcinomas in the liver in fine needle aspiration cytology: analysis of 20 cases-.: Na Hye Myong, Jae Soo Koh, Chang Won Ha, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1991;2(2):90-97.

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Abstract PDF: No abstract available.

Case Report

Fine Needle Aspiration Cytology of Metastatic Epithelial-Myoepithelial Carcinoma of the Scalp: A Case Report .: Mi Seon Kwon, Seung Sook Lee, Jae Soo Koh, Jin Haeng Chung; J Pathol Transl Med. 2000;11(2):93-97.

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Abstract PDF: Epithelial-myoepithelial carcinoma is an uncommon, low grade malignant epithelial neoplasm and metastasis is exceedingly rare. This article highlights the fine needle aspiration cytology(FNAC) of a case of metastatic epithelial-myoepithelial carcinoma of the scalp. A 51-year-old female presented with the left parietotemporal scalp mass two months after the left parotidectomy for epithelial-myoepithelial carcinoma. FNAC from the scalp mass showed a biphasic population of ductal epithelial and myoepithelial origin. These epithelial aggregates were numerous and formed a distinct three dimensional architecture in the background of numerous naked nuclei. The three dimensional architectures were predominantly composed of tightly cohesive eosinophilic ductular epithelial cells which tended to aggregate, overlap, and form tubules. Clear myoepithelial cells in three dimensional tissue fragment were inapparent and a few were attached to the periphery of the fragments. A few myoepithelial cells with clear abundant vaculoated cytoplasm were found in the foamy background. The cytological diagnosis was metastatic epithelial-myoepithelial carcinoma. The histologic findings of the scalp mass were those of typical epithelial-myoepithelial carcinoma. Cytologic distinction of epithelial-myoepithleial carcinoma, pleomorphic adenoma, and adenoid cystic carcinoma may be very difficult but careful attention to clinical features and cellualr details can classify these neoplasms correctly.

Original Articles

Fine needle aspiration cytology of secretory carcinoma of the breast: a case report.: Chang Won Ha, Jae Soo Koh, Na Hye Myong, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1992;3(1):25-29.

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Abstract PDF: No abstract available.

Fine needle aspiration cytology of the breast.: Kyung Ja Cho, Jae Soo Koh, Chang Won Han, Ja June Jang; J Pathol Transl Med. 1992;3(2):52-59.

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Abstract PDF: No abstract available.

Effusion cytology of multiple myeloma: a case report.: Jae Soo Koh, Chang Won Ha, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1992;3(2):90-93.

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Abstract PDF: No abstract available.

A case of hepatic actinomycosis disgnosed by fine needle aspiration cytology.: Chang Won Ha, Jae Soo Koh, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1992;3(2):100-103.

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Abstract PDF: No abstract available.

Case Report

Fine Needle Aspiration Cytology of Primary Malignant Lymphoma of the Thyroid Gland: A Case Report.: Mi Seon Kwon, Seung Sook Lee, Jae Soo Koh, Jin Haeng Chung, Kyo Young Lee; J Pathol Transl Med. 2001;12(1):67-71.

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Abstract: Primary malignant lymphoma of the thyroid gland is uncommon malignancies. Its fine needle aspiration cytology (FNAC) findings are rarely described in the literature. This article highlights the FNAC diagnosis of primary malignant lymphoma of the thyroid gland. A 70-year-old female presented with a rapidly enlarging thyroid mass of five months' duration. FNAC smears showed low cellularity consisting of predominantly atypical enlarged lymphoid cells admixed with a few small lymphocytes, plasma cells, and oncocytic cells. Some disrupted lymphoid cells were also present. The tumor cells infiltrated into the thyroid follicular epithelium forming lymphoepithelial lesion. The cytologic appearance showed a diffuse mixture of cell types with only a few small, mature lymphocytes and many enlarged lymphoid cells. The enlarged lymphoid cells were atypical and pleomorphic with nuclear clefting and irregularities. Grossly, the left lobe of the thyroid was nearly replaced by a diffuse firm to soft solid mass with smooth tan fish-flesh homogeneous cut surface. Histological diagnosis was diffuse large B-cell lymphoma with areas of marginal zone B-cell lymphoma of MALT type.

Original Article

Aspiration cytology of pilomatrixoma.: Jae Soo Koh, Chang Won Ha, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1993;4(1):25-28.

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Abstract PDF: No abstract available.

Case Report

Cytologic Findings of Primary Small Cell Carcinoma of the Urinary Bladder: A case report.: Mi Seon Kwon, Geung Hwan Ahn, Jin Haeng Chung, Seung Sook Lee, Jae Soo Koh; J Pathol Transl Med. 2001;12(2):121-126.

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Abstract PDF: Primary small cell carcinoma of the urinary bladder is a rare malignant tumor. A more rapidly fatal course may be seen in advanced stages of small cell carcinoma as compared to similar stages of urothelial carcinoma. It is very important to recognize this distinct form of bladder cancer by urinary cytology. The differential diagnosis of small cell carcinoma of the urinary bladder includes metastatic small cell carcinoma, urothelial carcinoma, and primary or secondary malignant lymphoma. This article highlights the urinary cytologic diagnosis of a case of primary small cell carcinoma. A 59-year-old male presented with gross hematuria for five months. Urinary cytology showed high cellularity consisting of tiny monotonous tumor cells in the necrotic background. The tumor cells occurred predominantly singly, but a few in clusters. The cytoplasm was so scanty that only a very narrow rim of it was seen. The nuclei were oval or round and had finely stippled chromatin. Rarely, the nuclei contain visible nucleoli. Frequently cell molding was noted in clusters. Many single cells demonstrated nuclear pyknosis or karyorrhexis. The histologic findings of transurethral resection and partial cystectomy specimen were those of small cell carcinoma. Cytologic distinction may be very difficult but careful attention to clinical features and cellualr details can classify these neoplasms correctly.

Original Articles

Effusion cytology of metastatic rhabdomyosarcoma.: Jae Soo Koh, Chang Won Ha, Kyung Ja Cho, Ja June Jang; J Pathol Transl Med. 1993;4(1):74-76.

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Abstract PDF: No abstract available.

Fine Needle Aspiration Cytologic Features of Follicular Lymphoma.: Jin Haeng Chung, Hwa Jeong Ha, Sun Hoo Park, Jae Soo Koh, Min Suk Kim, Seung Sook Lee, Kyung Ja Cho; J Pathol Transl Med. 2002;13(2):60-65.

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Abstract PDF: The accuracy of fine needle aspiration cytology(FNAC) for the diagnosis of follicular lymphoma was investigated by a review of 13 FNAC specimens from 10 patients. All patients included in this study were confirmed by surgical biopsy preceded by FNAC. Three aspirates were unsatisfactory because of scanty cellularity. Among the remaining 10 cases, 5(50%) were diagnosed as lymphoma, 3(30%) as reactive hyperplasia, one(10%) as metastatic small cell carcinoma, and one(10%) as granulomatous inflammation. Cytologic distinction between follicular lymphoma and reactive hyperplasia is very difficult with cytomorphology alone. Compared to reactive hyperplasia, the characteristic cytologic features such as relatively homogeneous cellular constituent, paucity of tingible body macrophages and lymphohistiocytic aggregates, and less mitotic activity in follicular lymphoma are important findings to prevent false negative diagnosis. In addition, lymphoglandular bodies are useful in distinguishing malignant epithelial tumor from lymphoid lesion.

Clinical Trial

Prognostic Significance of Ezrin Expression in Liposarcoma.: Jae Seok Lee, Min Sun Jin, Jung Eun Lee, Min Suk Kim, Dae Geun Jeon, Jae Soo Koh; Korean J Pathol. 2008;42(5):270-276.

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Abstract PDF: BACKGROUND
Ezrin has been reported to be involved in the metastasis of solid tumors in both an animal model and clinical trials. However, questions remains as to whether an ezrin expression is an independent predictor of the event-free survival of liposarcoma patients. METHODS: We analyzed 85 liposarcoma patients without metastasis at the time of presentation. We performed immunohistochemistry with anti-ezrin antibody, and we analyzed the association of an ezrin expression with the clinicopathological variables and event-free survival. RESULTS: Twenty-nine patients (34.1%) showed an ezrin expression. Among the 30 low-grade liposarcoma patients, only one patient showed ezrin positivity. The patients who had an ezrin expression were found to be at a significantly increased risk for metastasis compared with the patients who had no ezrin expression (risk ratio: 3.4, 95% confidence interval: 1.3-9.1). The 10-year metastasis-free survival rate was 26.9% for the patients with an ezrin expression and 86.7% for the patients without an ezrin expression. The ezrin expression rate increased with an advanced tumor grade and stage. CONCLUSION: An ezrin expression is an independent predictor of distant metastasis for liposarcoma. Thus, ezrin has the potential to provide additional prognostic information and to be a novel target for the development of new adjuvant therapies for treating the patients who suffer from liposarcoma.

Case Report

Cytologic Findings of Chordoma in Fine Needle Aspiration Cytology.: Han Suk Ryu, Min Suk Kim, Hwa Jung Ha, Jung Soon Kim, Myung Soon Shin, Sunhoo Park, Jin Haeng Chung, Jae Soo Koh, Seung Sook Lee; J Pathol Transl Med. 2004;15(1):45-51.

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Abstract PDF: It is important to recognize the pathognomonic cytologic findings of chordoma, because of overlapping cytologic features between chordoma, chondrosarcoma, myxofibrillary ependymoma, and metastatic adenocarcinoma. We reviewed the cytomorphologic features of 5 cases of chordoma diagnosed by fine needle aspiration cytology at Korean Cancer Center Hospital from 1987 to 2003. Clinical and radiographic findings of each case were reviewed. Four males and one female (29-54 years) had tumors involving the sacrum. Pain was the presenting symptom in 4 cases. The three cases showed moderate to high cellularity. In all cases, typical physaliferous cells with or without cytoplasmic processes were noted. In two cases, the background was myxoid with single scattered cells. Cell clusters showing cord-like arrangement were occasionally seen. The single or clustered cells showed mild cellular pleomorphism with slightly increased nuclear/cytoplasmic ratio. Mitotic figures were not seen. In our review, the recognition of physaliferous cells is the most important feature to diagnose chordoma and to differentiate it from other lesions mimicking chordoma.

Original Articles

Differential Diagnosis between Small Cell Carcinoma and Adenocarcinoma of Lung in Fine Needle Aspiration Cytology.: Young Hee Choi, Jae Soo Koh, Sunhoo Park, Min Suk Kim, Soo Youn Cho, Jung Soon Kim, Hwa Jung Ha, Seung Sook Lee; J Pathol Transl Med. 2006;17(2):120-125.

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Abstract PDF: Distinguishing small cell carcinoma from other lung malignancies is of great clinico-therapeutic significance. Small cell carcinoma is an aggressive tumor with a tendency to metastasize early. Survival time if untreated is low but this tumor is highly responsive to chemotherapy. We have occasionally experienced difficulties in differentiation between adenocarcinoma and small cell carcinoma of the lung in fine needle aspiration cytology (FNAC). The aim of this study was to investigate the possibility of distinguishing small cell carcinoma from adenocarcinoma of the lung in FNAC. We evaluated cytomorphological features of FNAC specimens from 62 small cell carcinomas and 57 adenocarcinomas from the lung that were confirmed by biopsy and/or immunohistochemistry on cell block. Cytomorphological details of the two tumors were compared. Nuclear smearing and nearly absent cytoplasm were the most distinct findings in small cell carcinoma compared to adenocarcinoma (p<0.05). Necrotic background, architecture and chromatin pattern, nuclear molding and nucleoli were significantly different (p<0.05). Nuclear size, nuclear membrane nature and nuclear size variation however were not helpful in distinguishing the two tumors. Combining several features described above, small cell carcinoma can be properly differentiated from adenocarcinoma on FNAC. FNAC is proposed as a diagnostic tool of small cell carcinoma of the lung in the case of inaccessibility to biopsy, and so may allow the proper therapeutic strategies to be determined in such cases.

Cytomorphologic Comparison of Hodgkin Lymphoma and Anaplastic Large cell Lymphoma in Fine Needle Aspiration Cytology.: Seung Sook Lee, Jae Soo Koh, Sunhoo Park, Min Suk Kim, Soo Youn Cho, Soo Young Chung, Han Suk Ryu, Jung Soon Kim, Hwa Jung Ha, Baek Youl Ryoo; J Pathol Transl Med. 2006;17(2):126-135.

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Abstract PDF: To study the differentiating cytomorphological features of Hodgkin lymphoma (HL) and anaplastic large cell lymphoma (ALCL) using fine needle aspiration cytology (FNAC), cytomorphological features of 16 patients with HL (n=8) or ALCL (n=8) were analyzed. In the initial cytological diagnosis prior to biopsy, HLs were properly diagnosed in 4 out of 8 cases (4 HL, 2 atypical, 2 benign), whereas all ALCL were diagnosed as malignancies. However, correct diagnosis of non-Hodgkin lymphoma (NHL) was made in only two ALCL patients (2 NHL, 1 HL, 1 sarcoma, 4 malignancy without specific type). Overall, the percentage of large abnormal cells ranged from 30% to 90% in ALCL except for one case, whereas it was less than 5% in all 8 HL. A spectrum of atypical cells was more characteristic of ALCL. In contrast, HL showed an sharp difference between reactive lymphoid cells and neoplastic ones (bimorphic pattern). Moreover, the emergence of kidney-shaped abnormal cells or wreath-like multinucleated cells was helpful in diagnosing ALCL. The combination of thesefeatures would be useful in differentiating HL and ALCL. Nevertheless, these two types of lymphomas cannot be definitely distinguished based on cytomorphological features alone. Therefore, the aim of FNAC would be to suggest a specific diagnosis and indicate the need for a biopsy.

Cytologic Evaluation of CellPrep(R) Liquid-based Cytology in Cervicovaginal, Body Fluid, and Urine Specimens: Comparison with ThinPrep(R).: Jae Soo Koh, Soo Yeon Cho, Hwa Jeong Ha, Jung Soon Kim, Myung Soon Shin; J Pathol Transl Med. 2007;18(1):29-35.

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Abstract PDF: This study purposed to evaluate a CellPrep(R) (CP) of liquid-based cytology (LBC) to search for a less expensive and automated alternative cytologic preparation technique applicable to usually encountered cytologic specimens. Cervicovaginal direct-to-vial split samples from 457 gynecologic patients, 40 body fluid samples, and 34 urine samples were processed with the CP technique and the results were compared with those of currently used ThinPrep(R) (TP) method. Both CP and TP methods provide evenly distributed thin layers of cells with little cellular overlaps or significant obscuring elements in most of cases. Staining quality of both preparations showed a little difference due to the difference of fixative solutions without significant distractions in cytologic interpretation. On the supposition that TP was a gold standard, sensitivity, specificity, positive predictive value, and negative predictive value of CP cytology were 89%, 98%, 86%, and 99% in the cervicovaginal smear, 89%, 82%, 80%, and 90% in body fluid, and all of these values were 100% in urine samples. To testify the availability of immunohistochemistry on CP preparations, cytokeratin, vimentin, and Ki-67 were applied on body fluid specimens, and all of these antibodies were specifically stained on targeted cells. Conclusively, the CP method gave comparable results to those of TP in terms of smear quality and cytologic diagnostic evaluation, and was available on immunohistochemistry. The CP method could offer a cost-effective and automated alternative to the current expensive techniques of liquid- based cytology on popular cytologic materials including cervicovaginal, body fluid, and urine specimens.

Case Reports

Fine Needle Aspiration Cytology of Granular Cell Tumor in Breast: A Case Report.: Soo Young Chung, Wo Chul Noh, Min Sun Jin, Seung Sook Lee, Jae Soo Koh; J Pathol Transl Med. 2007;18(2):157-160.

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Abstract PDF: Granular cell tumor (GCT) of the breast is a rare clinical entity, and is believed to be of schwannian origin and to follow a benign clinical course. A 50-year-old woman presented with a slowly growing mass in the right breast. Fine needle aspiration cytology revealed a cellular smear containing isolated or clustered cells showing round to oval nuclei with abundant oncocytic granular cytoplasm. Nuclei showed a fine granular chromatin pattern and occasional small single nucleoli. Cell boundaries were poorly defined, and naked nuclei were frequently found. Histologically, the tumor showed features of typical GCT, and immunohistochemical staining findings strongly supported the diagnosis. The present study demonstrates that GCT of the breast can mimic malignant lesions of breast both clinically and radiologically. The recognition of its cytologic features and suspicion of this lesion would undoubtedly aid the correct diagnosis of mammary GCT.

Adenoid Cystic Carcinoma of the Lung: Report of 2 cases.: Jae Soo Koh, Chang Won Ha, Na Hye Myong, Kyung Ja Cho, Mi Kyung Kim, Ja June Jang; Korean J Pathol. 1992;26(2):175-179.

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Abstract PDF: Adenoid cystic carcinoma of the lung is histologically and ultrastructurally identical to the salivary gland tumor of the same name and is characterized by infiltrative growth, local recurrence, and usually a prolonged clinical course. We have recently experienced two cases of adenoid cystic carcinoma arising in the lung. Case 1 was a 59 year-old male who presented with cough, fever, and chill of 1.5 months' duration, and case 2 was a 61 year-old male who was incidentally found to have a 3 to 4 cm sized lobulated mass in the right upper lobe. After being worked up, both patients underwent right pneumonectomy. In case 1, a 3x2 cm sized tumor was located in the lower bronchus, partly elevating toward the lumen and partly infiltrating into regional lymph nodes and lung parenchyma showing grayish-white and solid cut surface. Case 2 was a 3.5x3.5 cm sized upper bronchial tumor resembling the former in appearance. Histologically, the tumors were composed of small round hyperchromatic cells, forming solid, cribriform, acinar, or tubular structures. Luminal spaces in tumor cell nests contained PAS-positive mucinous or hyaline material. Among the tumor cells, scattered islands of normal submucosal gland were noticed.

Tonsillar Lymphangiomatous Polyp: Report of Two Cases.: Han Suk Ryu, Soo Young Jung, Jae Soo Koh, Seung Sook Lee; Korean J Pathol. 2006;40(5):381-384.

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Abstract PDF: Tonsillar lymphangiomatous polyp is an uncommon hamartomatous lesion that generally arises from the tonsillar surface, and it has rarely been reported in the medical literature. Because of the uncommon clinical and pathological features of these polyps, pathologists and clinicians may experience difficulty in correctly classifying them. We report herein two cases of lymphangiomatous polyp of the tonsil in a 49 year-old man and a 30 year-old man who both presented with a tonsillar mass of the palatine tonsil. Microscopically, there were protruding polypoid lesions that had a core of fibroadipose tissue with dilated multiple lymphatics and aggregated lymphoid tissue. Both patients have been stable since resection.

Adenoma of Retinal Pigment Epithelium: A case report.: Jae Soo Koh, Je G Chi; Korean J Pathol. 1996;30(11):1053-1056.

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Abstract PDF: A retinal pigment epithelium tumor is extremely rare, and the distinction from malignant melanoma or reactive hyperplasia of pigment epithelium is mandatory, clinically or pathologically. We report a case of adenoma of retinal pigment epithelium. A 21 year-old female presented with a sudden decrease of visual acuity. She had no previous inflammatory ocular disease. Fundic examination revealed an elevated mass at the temporal side of the right eye. With the suspicion of choroidal malignant melanoma, a right eye enucleation was done. Grossly there was a 0.7x0.5 cm dark soft broad-based elevated lesion in the temporal side. The anterior border was the ora serrata, and the posterior border reached the equatorial area. The tumor was confined to the intraocular portion. Histologically, the tumor mass was composed of the cuboidal or columnar cells arranged in papillary, trabecular, or solid pattern with fine fibrovascular stroma. The tumor cells were heavily pigmented. The cytoplasmic border of the tumor cell was indistinct and there was a finely granular brown pigment diffusely scattered in the cytoplasm. Mild anisokaryosis noted, but hyperchromatism or pleomorphism were negligible. The nucleoli were small. A transition between normal retinal pigment epithelium and tumor mass was noted. Reactive gliosis was noted at the periphery of the tumor.

Oxyphilic Clear Cell Carcinoma of the Ovary: A case report.: Chang Won Ha, Jae Soo Koh, Na Hye Myoung, Kyung Ja Cho, Sang Yoon Park, Mi Kyung Kim, Ja June Jang; Korean J Pathol. 1992;26(5):500-503.

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Abstract PDF: Oxyphilic clear cell carcinoma of the ovary is a variant of clear cell carcinoma with abundant eosinophilic cytoplasm described by Young & Scully in 1987. Thorough samplin is needed to identify typical foci of clear cell carcinoma for the differential diagnoses from a variety of ovarian tumors with oxyphilic cells. We report a case of oxyphilic clear cell carcinoma in a 65-year-old female patient who presented with vaginal spotting and lower abdominal discomfort. The excised mass was a 10x8x7cm sized, well circumscribe yellowish white solid ovarian tumor. Microscopically, the tumor showed glandular, papillary and alveolar growth patterns composed of cuboidal or hobnail-shaped oxyphilic cells.

Parosteal Ossifying Lipoma of Femur: A Case Report.: Jae Seok Lee, Wan Hyung Cho, Ji Yoong Yu, Min Suk Kim, Jae Soo Koh; Korean J Pathol. 2007;41(2):123-126.

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Abstract PDF: Parosteal lipoma is a rare and generally asymptomatic benign tumor of mature adipose tissue that is located in direct apposition to the external surface of the bone. These tumors are occasionally associated with reactive changes in the underlying bone. The reactive bone formation is generally restricted to the base of the tumor, that is, near the periosteum. We recently experienced a case of parosteal lipoma in the proximal femur, which displayed exuberant bone and cartilage formation, and this led us to a misdiagnosis of chondroblastic osteosarcoma on the initial biopsy. We report here on this case with a special emphasis on making the differential diagnosis from osteosarcoma.

Carcinosarcoma Arising from Mixed Tumor of the Parotid Gland: A case report.: Jae Soo Koh, Chang Won Ha, Na Hye Myoung, Kyung Ja Cho, Kyung Kyun Oh, Mi Kyung Kim, Ja June Jang; Korean J Pathol. 1992;26(5):530-532.

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Abstract PDF: A case of true malignant mixed tumor of the parotid gland is reported. The tumor, occuring in a 55-year-old man, started to grow rapidly after a long history of parotid mass. Total parotidectomy was carried out and the resected tumor measured 5x4x3 cm with a cut surface showing grayish-white solid and myxoid appearance. Microscopically, the tumor had both carcinomatous and sarcomatous elements, the former consisting of undifferentiated carcinoma with focal areas of ductal differentiation and the latter consisting of pleomorphic sarcoma with chondrosarcomatous differentiation. A remnant of benign pleomorphic adenoma could also be identified. Immunohistochemical study demonstrated focal cytokeratin reactivity in the carcinoma cells and vimentin in sarcomatous elements. It is assumed from these clinical and histological findings that the tumor had transformed from a pre-existing benign pleomorphic adenoma.

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