Hydatid cysts (echinococcosis) are caused by an infestation with larval tapeworms of the genus Echinococcus. The disease is extensively distributed worldwide, and it has been rarely reported in Korea. We describe the cytologic features of a case of hepatic hydatid cyst in a 28-year-old male. Computed tomography revealed a cystic mass in the right lobe of the liver. A right hemihepatectomy was performed. The aspirated fluid from the hepatic cystic mass was clear. The smears showed protoscolices, hooklets, and a laminated membrane.

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• Delayed Diagnosis of Imported Cystic Echinococcosis and Successful Treatment With Percutaneous Drainage and Albendazole in Korea: A Case Report
  Won Jun Choi, Hanna Jin, Hyeon Jae Jo, Chan Mi Lee, Chang Kyung Kang, Pyoeng Gyun Choe, Wan Beom Park, Nam Joong Kim, Min-Ho Choi
  Journal of Korean Medical Science.2025;[Epub]     CrossRef
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  Jong-Yil Chai
  Journal of the Korean Medical Association.2025; 68(1): 52.     CrossRef
• Chemical compounds, antioxidant and scolicidal potencies of Thymus fontanesii essential oil
  Sidi Mohammed Ammar Selles, Belkacem Tahar Belhamiti, Mokhtaria Kouidri, Amar Ait Amrane, Yamina Kadari, Zohra Kaddour, Souad Kabrit
  Experimental Parasitology.2024; 257: 108699.     CrossRef
• Complicated Liver Cystic Echinococcosis—A Comprehensive Literature Review and a Tale of Two Extreme Cases
  Valentin Calu, Octavian Enciu, Elena-Adelina Toma, Radu Pârvuleţu, Dumitru Cătălin Pîrîianu, Adrian Miron
  Tomography.2024; 10(6): 922.     CrossRef
• A rare case of hydatid cyst of the neck with concurrent pulmonary hydatid disease
  Amarendra Kumar Shukla, Amrutha Peter, Veerendra Arya, Vineet Dwivedi, Manish Kumar Gupta, Nimish Rai, Pawan Tiwari, Jitendra Kishore Bhargava
  Journal of Parasitic Diseases.2022; 46(4): 941.     CrossRef
• Hepatic Hydatid Cyst: A Case Report
  Wan Chul Kim, Jae Uk Shin, Su Sin Jin
  The Korean Journal of Gastroenterology.2021; 77(1): 35.     CrossRef
• An Imported Case of Disseminated Echinococcosis in Korea
  Dong Hoon Shin, Hae Chan Jo, Jeong-Han Kim, Kang Il Jun, Wan Beom Park, Nam-Joong Kim, Min-Ho Choi, Chang Kyung Kang, Myoung-don Oh
  The Korean Journal of Parasitology.2019; 57(4): 429.     CrossRef
• Cytology of hydatid cyst mimicking intra‐abdominal sarcoma, diagnosed by fine‐needle aspiration
  Busra Ozbek, Nadir Paksoy
  Diagnostic Cytopathology.2018; 46(4): 362.     CrossRef
• Clinical Update on Parasitic Diseases
  Min Seo
  Korean Journal of Medicine.2013; 85(5): 469.     CrossRef

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• Analysis of Prognostic Risk Factors of Endoscopic Submucosal Dissection (ESD) and Curative Resection of Gastrointestinal Neuroendocrine Neoplasms
  Yuan Si, ChaoKang Huang, JingBin Yuan, XianHui Zhang, QingQiang He, ZhiJin Lin, Ling He, ZhongXin Liu, Yuvaraja Teekaraman
  Contrast Media & Molecular Imaging.2022;[Epub]     CrossRef
• Standardization of the pathologic diagnosis of appendiceal mucinous neoplasms
  Dong-Wook Kang, Baek-hui Kim, Joon Mee Kim, Jihun Kim, Hee Jin Chang, Mee Soo Chang, Jin-Hee Sohn, Mee-Yon Cho, So-Young Jin, Hee Kyung Chang, Hye Seung Han, Jung Yeon Kim, Hee Sung Kim, Do Youn Park, Ha Young Park, So Jeong Lee, Wonae Lee, Hye Seung Lee,
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  Diagnostic Cytopathology.2019; 47(7): 720.     CrossRef
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  Bohyun Kim, Han-Seong Kim, Kyung Chul Moon
  Diagnostic Pathology.2019;[Epub]     CrossRef
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  Tiffany Y. Chen, Annie O. Morrison, Joe Susa, Clay J. Cockerell
  Journal of Cutaneous Pathology.2017; 44(11): 978.     CrossRef
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• Spectrum of Gastroenteropancreatic NENs in Routine Histological Examinations of Bioptic and Surgical Specimen: A Study of 161 Cases Collected from 17 Departments of Pathology in the Czech Republic
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Soft tissue myoepithelioma is a rare neoplasm composed of myoepithelial cells. Here, we describe the cytologic features of soft tissue myoepithelioma arising on the right forearm in an 18-year-old man. The excised tumor (3.0×1.8×1.5 cm) was well-demarcated, yellow-gray, soft, and myxoid. The cytologic smears showed round to spindle, epithelioid, and plasmacytoid cells in the myxoid background. The nuclei were uniform, round to ovoid, with finely distributed chromatin and eosinophilic or pale cytoplasm. The tumor cells demonstrated immunoreactivity for cytokeratin (AE1/AE3), epithelial membrane antigen, S100 protein, and glial fibrillary acidic protein. Electron microscopy showed intermediate filaments, desmosomes, and basal lamina.

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• Myoepithelial tumors of soft tissue and bone in children and young adults: A clinicopathologic study of 40 cases occurring in patients ≤ 21 Years of age
  Suzanna J. Logan, Carina A. Dehner, Fatimah I. Alruwaii, Nasir Ud Din, Damon R. Olson, Karen J. Fritchie, Gregory W. Charville, Melissa M. Blessing, Andrew L. Folpe
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• Fine-needle aspiration cytopathology of soft tissue myoepithelioma: an analysis of seven cases
  Paul E. Wakely, Momin T. Siddiqui
  Journal of the American Society of Cytopathology.2022; 11(1): 31.     CrossRef
• Cytology‐histology correlation of myoepithelial tumors harboring EWSR1‐POU5F1 fusions: A report of two cases
  Ian A. Gelarden, Lucy Fu, Kai Lee Yap, Aida I. Richardson, Pauline M. Chou
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• A case of myoepithelial carcinoma of the left shoulder
  Shuhei ISHII, Noriyuki FURUTA, Kyoko KOMATSU, Yoshiya SUGIURA, Noriko MOTOI, Yutaka TAKAZAWA, Yuko SUGIYAMA, Yuichi ISHIKAWA
  The Journal of the Japanese Society of Clinical Cytology.2018; 57(2): 129.     CrossRef
• Fine‐needle aspiration of soft tissue myoepithelioma
  Gang Wang, Tracy Tucker, Tony L. Ng, Carlos F. Villamil, Malcolm M. Hayes
  Diagnostic Cytopathology.2016; 44(2): 152.     CrossRef
• A case report of spindle cell myoepithelioma with extensive lipomatous metaplasia and thick collagen bundles in the submandibular gland
  Mi Jung Kwon, Hye Jeong Kim, Bumjung Park, Seong Jin Cho, Hyung Sik Shin, Hye‐Rim Park, Soo Kee Min, Jinwon Seo, Kyueng‐Whan Min, Eun Sook Nam
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• Myoepithelioma of soft tissue, a case report
  Hassania Ameurtesse, Leila Chbani, JM Coindre, Hinde Elfatemi, Toufik Harmouch, Afaf Amarti
  Research.2014;[Epub]     CrossRef

Follicular dendritic cell sarcoma (FDCS) is a rare malignancy arising from the antigen-presenting cells in the lymph node and extranodal tissue. We describe a 31-year-old male patient who presented with a swelling of the left parapharynx. The radiologic findings showed a 4.7×4.5×1.9 cm-sized, ill-defined mass in the left parapharyngeal space. A fine-needle aspiration cytology was performed and it showed scattered, irregular, cohesive clusters of tumor cells with a spindle-to-ovoid shape with irregular contours in a background of lymphocytes. Based on these findings, a diagnosis of spindle cell neoplasm was made. The surgically resected tumor was composed of elongated, ovoid or polygonal cells showing positive immunohistochemistry for CD21, CD23, and CD35. Postoperatively, the residual tumor was observed to undergo a rapidly growth. There is an overlap in the cytologic and histologic findings between FDCS of the parapharynx and other tumors. Pathologists should therefore be aware of its characteristics not only to provide an accurate diagnosis but also to recommend the appropriate clinical management.

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• Extranodal Follicular Dendritic Cell Sarcoma of the Head and Neck Region: A Clinicopathological Study of 7 Cases
  Nasir Ud Din, Zubair Ahmad, Shabina Rahim, Karen Fritchie, Muhammad Usman Tariq, Arsalan Ahmed
  International Journal of Surgical Pathology.2023; 31(6): 1067.     CrossRef
• Cytomorphology of follicular dendritic cell sarcoma: a report of 7 cases with an emphasis on the diagnostic challenges
  Cody Weimholt, Jalal B. Jalaly, Cedric Bailey
  Journal of the American Society of Cytopathology.2023; 12(3): 229.     CrossRef
• Follicular dendritic cells
  Seham A. Abd El‐Aleem, Entesar Ali Saber, Neven M. Aziz, Hani El‐Sherif, Asmaa M. Abdelraof, Laiche Djouhri
  Journal of Cellular Physiology.2022; 237(4): 2019.     CrossRef
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  Xing Zhao, Dayong Sun, Gang Zhang
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  A. Dutta, P. Arun, P. Roy, I. Arun
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  Fabio Facchetti, Luisa Lorenzi
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  RUI-FEN WANG, WEI HAN, LEI QI, LI-HUI SHAN, ZHENG-CAI WANG, LI-FENG WANG
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• Follicular Dendritic Cell Sarcoma of Parapharyngeal Space: A Case Report and Review of the Literature
  Turki Al-Hussain, Muhammad Saleem, Suresh Babu Velagapudi, Mohammad Anas Dababo
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• Clinical and pathological features of head and neck follicular dendritic cell sarcoma
  Ji Li, Min-Li Zhou, Shui-Hong Zhou
  Hematology.2015; 20(10): 571.     CrossRef