Journal of Pathology and Translational Medicine

Yoon Kyung Jeon

12 Articles

Cytologic Features and BRAF Mutation of Hyalinizing Trabecular Adenoma of the Thyroid: A Case Report with Review of the Literature.: Se Min Jang, Young Ha Oh, Yoon Kyung Jeon, Yong Wook Park, Moon Hyang Park; Korean J Pathol. 2011;45(4):428-433.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.4.428

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A hyalinizing trabecular adenoma (HTA) is a rare benign thyroid tumor of follicular epithelial cell origin with a trabecular-alveolar growth pattern and marked intratrabecular hyalinization. The cytological and histological features of HTA are very similar to those of papillary and medullary carcinomas of the thyroid. Therefore, an accurate diagnosis of HTA is important to avoid unnecessary and potentially harmful management of patients. However, the results of BRAF gene mutation analysis shown by many studies are distinctly different between HTAs and papillary thyroid carcinomas. Herein, we describe a rare case of HTA of the thyroid in a 49-year-old female and consider its characteristic cytological features and BRAF gene mutation analysis results with a brief review of the literature.

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Hyalinizing trabecular tumor, a rare histologically unique tumor of the thyroid, coexisting with papillary thyroid carcinoma
Chiu-Hsuan Cheng
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A Case of Hyalinizing Trabecular Tumor of the Thyroid Gland
Kun Woo Kim, Sang Joon Lee, Phil-Sang Chung, Junghwan Moon
Korean Journal of Otorhinolaryngology-Head and Neck Surgery.2012; 55(12): 795. CrossRef

WHO Classification of Malignant Lymphomas in Korea: Report of the Third Nationwide Study.: Jin Man Kim, Young Hyeh Ko, Seung Sook Lee, Jooryung Huh, Chang Suk Kang, Chul Woo Kim, Yun Kyung Kang, Jai Hyang Go, Min Kyung Kim, Wan Seop Kim, Yoon Jung Kim, Hyun Jung Kim, Hee Kyung Kim, Jong Hee Nam, Hyung Bae Moon, Chan Kum Park, Tae In Park, Young Ha Oh, Dong Wha Lee, Jong Sil Lee, Juhie Lee, Hyekyung Lee, Sung Chul Lim, Kyu Yun Jang, Hee Kyung Chang, Yoon Kyung Jeon, Hye Ra Jung, Min Sun Cho, Hee Jeong Cha, Suk Jin Choi, Jae Ho Han, Sook Hee Hong, Insun Kim; Korean J Pathol. 2011;45(3):254-260.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.3.254

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Abstract PDF

BACKGROUND
The aim of study was to determine the relative frequency of malignant lymphoma according to World Health Organization (WHO) classification in Korea.
METHODS
A total of 3,998 cases diagnosed at 31 institutes between 2005 and 2006 were enrolled. Information including age, gender, pathologic diagnosis, site of involvement and immunophenotypes were obtained.
RESULTS
The relative frequency of non-Hodgkin lymphoma (NHL) and Hodgkin lymphoma (HL) was 95.4% and 4.6%, respectively. B-cell lymphomas accounted for 77.6% of all NHL, while T/natural killer (T/NK)-cell lymphomas accounted for 22.4%. The most frequent subtypes of NHL were diffuse large B-cell lymphoma (42.7%), extranodal marginal zone B-cell lymphoma (MZBCL) of mucosa-associated lymphoid tissue (19.0%), NK/T-cell lymphoma (6.3%) and peripheral T-cell lymphoma (PTCL), unspecified (6.3%), in decreasing order. The relative frequency of HL was nodular sclerosis (47.4%), mixed cellularity (30.6%), and nodular lymphocyte predominant (12.1%) subtypes. Compared with a previous study in 1998, increase in gastric MZBCL and nodular sclerosis HL, and slight decrease of follicular lymphoma, PTCL, and NK/T-cell lymphoma were observed.
CONCLUSIONS
Korea had lower rates of HL and follicular lymphoma, and higher rates of extranodal NHL, extranodal MZBCL, and NK/T-cell lymphoma of nasal type compared with Western countries. Changes in the relative frequency of lymphoma subtypes are likely ascribed to refined diagnostic criteria and a change in national health care policy.

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Extranodal NK/T Cell Lymphoma Accompanied by Heavy Eosinophilic Infiltration and Peripheral Blood Eosinophilia, Involving Skeletal Muscles.: Jin Ho Paik, Yoon Kyung Jeon, Heounjeong Go, Chul Woo Kim; Korean J Pathol. 2011;45:S70-S74.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.S1.S70

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Abstract PDF

The patient was a 52-year-old female with swelling in both lower legs and peripheral blood eosinophilia. Biopsy specimen revealed the heavy infiltration of eosinophils with sparse small lymphocytes showing mild atypia. The diagnosis was Kimura disease. The symptoms including eosinophilia were relieved by steroid treatment. At 17 months from initial biopsy, the patient developed swelling of the buttock. At 25 months, fever and dyspnea with multiple lung nodules developed. Wedge resection revealed multiple aggregates of CD3(+), CD56(+), Epstein-Barr virus(+) large atypical lymphocytes with necrosis. The patient was finally diagnosed with extranodal NK/T cell lymphoma (NKTL). Epstein-Barr virus in situ hybridization retrospectively performed on the previous biopsies demonstrated Epstein-Barr virus infection in small CD3(+) lymphocytes. The patient expired after 26 months despite chemotherapy. Blood eosinophilia correlated well with disease activity during the clinical course. This case shows not only unusual histologic features, which hampered the correct diagnosis, but also a unique clinical manifestation of NKTL.

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Korean Pediatric/Adolescent Lymphoma: Incidence and Pathologic Characteristics.: Seung Sook Lee, Jin Man Kim, Young Hyeh Ko, Jooryung Huh, Chang Suk Kang, Chul Woo Kim, Yun Kyung Kang, Jai Hyang Go, Min Kyung Kim, Wan Seop Kim, Yoon Jung Kim, Hyun Jung Kim, Hee Kyung Kim, Jong Hee Nam, Hyung Bae Moon, Chan Kum Park, Tae In Park, Young Ha Oh, Dong Wha Lee, Jong Sil Lee, Juhie Lee, Hyekyung Lee, Sung Chul Lim, Kyu Yun Jang, Hee Kyung Chang, Yoon Kyung Jeon, Hye Ra Jung, Min Sun Cho, Hee Jeong Cha, Suk Jin Choi, Jae Ho Han, Sook Hee Hong, Insun Kim; Korean J Pathol. 2010;44(2):117-124.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.2.117

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Abstract PDF

BACKGROUND
The Hematopathology Study Group of the Korean Society of Pathologists conducted a nation-wide retrospective analysis of Korean pediatric lymphoma, to provide pathologic data on pediatric/adolescent lymphoma subtypes and features.
METHODS
All lymphoma cases of all age groups were collected during a recent 2 year-period (2005-2006) from 32 institutes in Korea. Among 3,686 lymphoma patients, 142 who were age 18 or less were classified according to the World Health Organization (WHO) classification.
RESULTS
Among 142 pediatric/adolescent lymphoma patients, Hodgkin lymphoma accounted for 21 (14.8%) and non-Hodgkin lymphoma (NHL) for 121 (85.2%). Hodgkin lymphoma appears to be more common in the pediatric/adolescent age group than in the all-ages group (14.8% vs 4.4%). T- and natural killer cell-NHL was more common in the pediatric/adolescent age group than in the all ages group (46.3% vs 22%). The majority of Korean pediatric/adolescent NHL cases was composed of Burkitt lymphoma, T- or B-lymphoblastic lymphoma, anaplastic large-cell lymphoma, and diffuse large B-cell lymphoma. For lymphoma patients under the age of 6 years, most had B-lymphoblastic or Burkitt lymphoma, which commonly presented at extranodal sites.
CONCLUSIONS
The distribution of lymphoma subtypes in the pediatric/adolescent age group is quite different from the distribution of adults, but it was quite similar to distribution in Western countries.

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A Case of Nasal Type Extranodal NK/T Cell Lymphoma Incidentally Detected in a Child
Ha Jin Oh, Sang Hyun Park, Hae In Jang, Dong Hoon Lee, Yoo Duk Choi, Hee Jo Baek, Hoon Kook
Clinical Pediatric Hematology-Oncology.2015; 22(1): 76. CrossRef

Detection of SV40 Large T Antigen in Malignant Lymphomas.: Young A Kim, MeeSoo Chang, Jinho Paik, Sun Och Yoon, Yoon Kyung Jeon, Chul Woo Kim, Ji Eun Kim; Korean J Pathol. 2009;43(4):312-316.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.4.312

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BACKGROUND
The association of simian virus 40 (SV40) with certain types of human cancers, including malignant lymphomas, has been a topic of interest for some time. Although the virus is distributed worldwide, its incidences vary according to the specific types of tumors, and the epidemiological areas. The aim of this study was to investigate the frequency of SV40 in malignant lymphomas among Korean patients. METHODS: One hundred seventy three cases of malignant lymphomas were evaluated by immunohistochemical staining for SV40 large T antigen (TAg), using an extremely sensitive, tyramide based, catalyzed signal amplification method. RESULTS: From 158 non-Hodgkin's lymphomas, including 115 diffuse large B-cell lymphomas, and 15 Hodgkin's lymphomas, none of the cases were positive for SV40 TAg. CONCLUSIONS: SV40 does not appear to be related to the pathogenesis of malignant lymphomas among Koreans.

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No Detection of Simian Virus 40 in Malignant Mesothelioma in Korea
Minseob Eom, Jamshid Abdul-Ghafar, Sun-Mi Park, Joung Ho Han, Soon Won Hong, Kun Young Kwon, Eun Suk Ko, Lucia Kim, Wan Seop Kim, Seung Yeon Ha, Kyo Young Lee, Chang Hun Lee, Hye Kyoung Yoon, Yoo Duk Choi, Myoung Ja Chung, Soon-Hee Jung
Korean Journal of Pathology.2013; 47(2): 124. CrossRef

Intranodal Palisaded Myofibroblastoma with Desmin Expression : A Brief Case Report.: Dong Chul Kim, Tae Hoon Kang, Min A Kim, Yoon Kyung Jeon; Korean J Pathol. 2009;43(3):263-265.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.3.263

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Abstract PDF: Intranodal palisaded myofibroblastoma is a rare benign mesenchymal neoplasm of the lymph node. It is characterized by intranodal spindle cell proliferation along with amianthoid fibers and prominent hemorrhage. It has been rarely reported in South Korea. We report here on a case of palisaded myofibroblastoma that arose in the left inguinal lymph node. The tumor mass was well demarcated, and it was composed of a proliferation of benign-looking spindle cells. It showed focal hemorrhage and a fibrous pseudocapsule. The tumor cells displayed little pleomorphism, no mitotic count, and characteristic palisading nuclei and amianthoid fibers. The tumor cells were positive for smooth muscle actin, vimentin, and also for desmin, but they were negative for S-100 protein, supporting the diagnosis of myofibroblastoma.

Clinicopathologic Study of Chromosomal Aberrations in Gastric Lymphomas of Korean Patients.: Wook Youn Kim, Jung Ho Kim, Hyoungsuk Ko, Young A Kim, Yoon Kyung Jeon, Chul Woo Kim; Korean J Pathol. 2009;43(1):5-12.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.1.5

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Abstract PDF

BACKGROUND
The incidence and clinical correlation of MALT1 translocation and numerical aberrations in Korean gastric MALT lymphoma patients have been rarely reported. We studied the incidence and clinicopathologic relationship of these chromosomal aberrations in Korean gastric lymphomas.
METHODS
Seventy-six gastric lymphomas, which consisted of 40 low grade MALT lymphoma, 4 high grade MALT lymphoma and 32 diffuse large B-cell lymphoma (DLBCL) cases, were analyzed for the detection of t(11;18) API2-MALT1, t(14;18) IgH-MALT1 and aneuploidies of chromosomes 3 or 18 using fluorescence in situ hybridization.
RESULTS
The t(11;18) was demonstrated in 3 low grade MALT lymphomas (7.5%) and one DLBCL, which was associated with advanced stage, deeper invasion, and disease progression or relapse. The t(14;18) was demonstrated in none of these cases. Trisomy 3 and 18 were detected in 8 (11%) and 11 of 76 cases (12.5%) respectively, and found only in translocation-negative cases. Two of 4 high grade MALT lymphomas showed trisomy 18. All patients survived with successful second treatment after progression or relapse.
CONCLUSIONS
The t(11;18) API2-MALT1 was not quite frequent in Korean low grade gastric MALT lymphomas and was associated with advanced clinical situations. Overall prognosis was good for long-term follow-up regardless of progression or relapse.

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Clinicopathologic Study of Chromosomal Aberrations in Ocular Adnexal Lymphomas of Korean Patients
Hokyung Choung, Young A Kim, Namju Kim, Min Joung Lee, Sang In Khwarg
Korean Journal of Ophthalmology.2015; 29(5): 285. CrossRef

Diffuse Large B Cell Lymphoma Shows Distinct Methylation Profiles of the Tumor Suppressor Genes among the Non-Hodgkin's Lymphomas.: Sun Och Yoon, Young A Kim, Yoon Kyung Jeon, Ji Eun Kim, Gyeong Hoon Kang, Chul Woo Kim; Korean J Pathol. 2008;42(1):16-20.

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Abstract PDF: BACKGROUND
Aberrant methylation of CpG islands in promoter regions is one of the major mechanisms for silencing of tumor suppressor genes in various types of human cancers including non-Hodgkin's lymphomas (NHL). In this study, we investigated the aberrant promoter methylation status of known or suspected tumor suppressor genes in NHLs and compared the methylation profiles between B-cell and T/NK-cell NHLs.
METHODS
54 cases of B-cell NHLs and 16 cases of T/NK-cell NHLs were examined for the methylation status of eight genes using methylation specific PCR.
RESULTS
CpG islands methylation was variously found in eight genes as follows; DAPK (71%), MT1G (70%), p16 (53%), CDH1 (53%), THBS1 (56%), MGMT (27.1%), COX2 (13%), and RUNX3 (11.4%). In six cases (8 %), methylation was not observed in any of these genes. Overall methylation index of B-cell NHLs (0.48) was significantly higher than that of T/NK-cell NHLs (0.32). Of eight genes tested, THBS1 and CDH1 methylations were much more prominent in diffuse large B-cell lymphomas than in T/NK-cell NHLs or other B-cell NHLs.
CONCLUSION
This study suggests that aberrant CpG island methylation is a frequent event in NHLs, and diffuse large B-cell lymphomas show overlapping but distinct methylation profiles.

Epstein-Barr virus-associated Inflammatory Pseudotumor-like Follicular Dendritic Cell Tumor in the Spleen of a Patient with Diffuse Large B Cell Lymphoma: A Case Report and Review of the Literature.: Sun Och Yoon, Hyoungsuk Ko, Baek hui Kim, Ghee Young Kwon, Yoon Kyung Jeon, Chul Woo Kim; Korean J Pathol. 2007;41(3):198-202.

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Abstract PDF: We report a case of an Epstein-Barr virus (EBV)-associated inflammatory pseudotumor-like follicular dendritic cell tumor (IPT-like FDC tumor). The tumor occurred in the spleen of a 64-year-old woman with a history of a diffuse large B-cell lymphoma (DLBCL) of neck nodes that presented four years ago. The splenectomy specimen revealed a 5 cm-sized, tan-colored and well-circumscribed mass. Histologically, spindle or ovoid cells with large vesicular nuclei were admixed with abundant inflammatory cells. Immunohistochemically, spindle cells were positive for FDC marker CD35, but negative for CD20, CD30 and ALK. EBV was detected almost exclusively in spindle cells by EBER in situ hybridization. IPT-like FDC tumors are rare, and are recognized as a distinctive clinicopathologic variant of FDC tumors. Among only 18 similar cases reported in the English language literature, the present case is the first case of a patient with a history of DLBCL.

Histiocytic Sarcoma of the Spleen: A Case Report and Review of the Literature.: Jin Ho Paik, Yoon Kyung Jeon, Sung Shin Park, Hye Sook Min, Young A Kim, Ji Eun Kim, Chul Woo Kim; Korean J Pathol. 2005;39(5):356-359.

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Abstract PDF: True histiocytic sarcoma is an extremely rare tumor. Its clinicopathological features are not clearly understood. Here, we report the first Korean case of primary splenic histiocytic sarcoma. A 64-year-old female having refractory thrombocytopenia, anemia and splenic mass was admitted to the hospital, and received splenectomy. Grossly, spleen was enlarged up to 18 x 13 x 8 cm and occupied with multinodular masses. Microscopically, the masses were composed of atyical large cells with abudant cytoplasm and vesicular nuclei with prominent hemophagocytosis. The tumor cells were CD68 (+), S-100 protein (-), CD21 (-), CD1a (-). After splenectomy, thrombocytopenia and anemia were corrected. However two months later the symptoms recurred, and the patient died 15 months after splenectomy. This case shared the common clinicopathologic features with the several previously reported cases in other countries, represented by splenic mass formation and prominent hemophagocytosis associated with thrombocytopenia and anemia, often leading to poor outcome.

Liquid-Based Cytology Using MonoPrep2(TM) System in Cervicovaginal Cytology: Comparative Study with Conventional Pap Smear and Histology.: Yoon Kyung Jeon, Ok Ran Kim, Ki Wha Park, Soon Beom Kang, In Ae Park; Korean J Cytopathol. 2004;15(1):33-39.

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Abstract PDF: We compared the diagnostic accuracy of liquid-based cervicovaginal cytology using MonoPrep2(TM) system (Monogen, Herndon, Virginia, USA), a manual system based on membrane filtration method, with conventional Pap smear. Study population included 92 patients visiting the gynecologic department under the suspicion of uterine cervical disease. In thirty of them, surgical biopsy was performed. MonoPrep2(TM) system provided well-preserved monolayer specimen with good nuclear morphology. However, about 19% of specimens were inadequate to interpret due to low cellularity. The detection rate of abnormal cells more than ASCUS (atypical squamous cells of unknown significance) was 23.9% and higher than 19.4 % of conventional Pap smear. Diagnostic concordance rate with conventional Pap smear was 81%, and severe discordance rate influencing on the management of patient was 7.6 %. Among these seven cases, MonoPrep2(TM) system was more diagnostic only in four. In comparison with histology, the sensitivity of diagnosis of MonoPrep2(TM) system was 78.9% and slightly higher than 73.5% of conventional Pap smear. However, the specificity was 81.1% and lower than 90.9% of Pap smear. In conclusion, MonoPrep2(TM) system provided diagnostic accuracies similar to the conventional Pap smear. The inexpertness of slide preparation and the low cellularity were considered to endow a limitation in more accurate evaluation.

Expression of Cytokeratin 7 and 20 According to The Anatomical Location of Colon Cancer and The Differential Diagnosis with Cholangiocarcinoma.: Yoon Kyung Jeon, Sun Lee, Byoung Kwon Kim, Woo Ho Kim, Gyeong Hoon Kang; Korean J Pathol. 2002;36(3):146-153.

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Abstract PDF: BACKGROUND
Colonic adenocarcinoma usually shows CK7 negativity and CK20 positivity, which helps to differentiate it from cholangiocarcinoma usually showing a reverse immunohistochemical profile. We immunohistochemically investigated the pattern of CK7 and 20 expressions according to the anatomical location of colon cancer to refine the usefulness of CK expression in differential diagnosis.
METHODS
Immunohistochemical staining was done on 90 cases of surgically resected colon cancers and 84 cases of cholangiocarcinomas.
RESULTS
When the cases of colon cancer were divided into CATD (from the cecum to the descending colon) (32), sigmoid (26), and rectum (32), the positivity of CK7 was 41%, 15% and 28%, respectively, and the negativity of CK20 was 25%, 0 and 9% (p=0.013), respectively. In sigmoid colon cancers, 22 cases (85%) exhibited CK7-/CK20+ immunophenotype. However, the percentage decreased to 63% in the rectum and 47% in CATD. The CK7+/CK20- immunophenotype was found only in cancers in the cecum and ascending colon. The expression of CK7 was related to histologic differentiation (p=0.017).
CONCLUSIONS
The aberrant expressions of CKs were frequent in cancers of the rectum and ascending colon which are located in the transition site from the anus and small bowel, respectively. If adenocarcinoma in the liver were CK7+/CK20+ or CK7-/CK20-, the possibility of metastatic adenocarcinoma from CATD and rectum should be considered.

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