Journal of Pathology and Translational Medicine

Original Article

Can BAP1 expression loss in mesothelial cells be an indicator of malignancy?: Hanife Gulnihal Ozdemir, Sermin Coban Kokten, Nagehan Ozdemir Barisik; J Pathol Transl Med. 2020;54(6):497-503. Published online November 9, 2020; DOI: https://doi.org/10.4132/jptm.2020.09.14

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Background
Malignant mesothelioma is a highly aggressive tumor that can be confused with a benign mesothelial lesion, especially cytomorphologic lesions. BRCA1-associated protein 1 (BAP1) acts as a tumor suppressor. In this study, we aim to investigate the value of BAP1 staining of malignant mesothelioma cases with expression loss and diagnosis in cell block and biopsy tissue.
Methods
Between January 2009 and March 2017, 64 mesotheliomas, 117 reactive mesothelial hyperplasias, and 20 fibrinous pleuritis/pericarditis were diagnosed with morphologic and immunohistochemical findings in our pathology clinic and were included in the study. Formalin-fixed, paraffin-embedded tissues were immunohistochemically examined for BAP1. Inflammatory and stromal cells were used as positive internal controls. BAP1 was assessed for nuclear staining in mesothelial cells.
Results
Examinations of the relationship between patient diagnosis and BAP1 biopsy status showed that the BAP1 loss rate (76.6%) was significantly higher in malignant mesothelioma cases than in other benign diseases (0%) (p<.001). Sensitivity and specificity were 76.56% and 100%, respectively, for biopsy tissue from malignant mesothelioma. Sensitivity and specificity were both 100% for BAP1 test on cell block tissue. Furthermore, the consistency between BAP1 cell block and biopsy results was excellent (ĸ=0.90) and the correlation was significant (p<.001).
Conclusions
This study shows that BAP1 expression loss in both cytology and biopsy tissue in biopsy-confirmed malignant mesothelioma cases is an essential parameter for malignant mesothelioma diagnosis.

Citations

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Diagnostic Challenges in the Pathological Approach to Pleural Mesothelioma
Stefano Lucà, Giovanna Pignata, Alessandro Cioce, Cecilia Salzillo, Rossella De Cecio, Gerardo Ferrara, Carminia Maria Della Corte, Floriana Morgillo, Alfonso Fiorelli, Marco Montella, Renato Franco
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Thrombocytosis as a paraneoplastic syndrome in metastatic malignant peritoneal mesothelioma of biphasic morphology mimicking ovarian adenocarcinoma: A case report
Moustafa S. Alhamadh, Rakan B. Alanazi, Osama Mohaamad Wadaan, Abdulrahman Yousef Alhabeeb, Mohammad Alkaiyat, Ohoud Zaid Aljarbou, Fouad Sabatin
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Primary cardiac mesothelioma presenting with fulminant recurrent pericarditis: a case report
Shmuel Schwartzenberg, Yaron Shapira, Victor Rubachevski, Ram Sharony, Harry Klimis, Domenico Filomena, Edgar Francisco Carrizales Sepulveda, Nikolaos Spinthakis, Jonathan Senior
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Case Studies

Malignant Pleural Effusion from Metastatic Prostate Cancer: A Case Report with Unusual Cytologic Findings: Jinyoung Jeon, Tae-Jung Kim, Hong Sik Park, Kyo-Young Lee; J Pathol Transl Med. 2018;52(4):257-261. Published online June 7, 2018; DOI: https://doi.org/10.4132/jptm.2018.05.08

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Abstract PDF

We present a case of 55-year-old man who complained of dyspnea and sputum for a month. He was an ex-smoker with a history of prostate cancer and pulmonary tuberculosis. Chest radiographs revealed bilateral pleural effusions of a small to moderate amount. Pigtail catheters were inserted for drainage. The pleural fluid consisted of large clusters and tightly cohesive groups of malignant cells, which however could not be ascribed to prostate cancer with certainty. We performed immunocytochemical panel studies to determine the origin of cancer metastasis. The immunostaining results were positive for prostate-specific antigen, alpha-methylacyl-coenzyme A racemase, and Nkx 3.1, consistent with prostate cancer. Pleural effusion associated with prostate cancer is rare. To our knowledge, this is the first case report in Korea to describe cytologic features of malignant pleural effusion associated with prostate cancer.

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Pleural Metastasis as an Initial Presentation of Prostate Cancer: Case Report and Literature Review
Katarzyna Skrobisz, Kevin Miszewski, Laura Miszewska, Michał Bieńkowski, Marcin Matuszewski, Michał Studniarek
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EBUS-TBNA pleural biopsy reveals prostate cancer metastasis: A rare case report and review of the literature
Fotios Sampsonas, Dimitrios Komninos, Vasilina Sotiropoulou, Matthaios Katsaras, Dimitra Gkanetsou, Ourania Papaioannou, Panagiota Tsiri, Vasiliki Tzelepi, Argyrios Tzouvelekis
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Cytopathological Features of Extensive Bilateral Pleural Effusions in Metastatic Prostate Cancer: Report of a Rare Case
Hehua Huang, Caroline Yap
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Bilateral pleural effusion: etiology, diagnostics
N. A. Stogova
PULMONOLOGIYA.2022; 32(6): 885. CrossRef
Rare Metastatic Prostate Cancer Mimicking Lymphoma with Malignant Pleural Effusion
Tung Liu, En Meng, Yu-Chun Lin, Tai-Kuang Chao, Yi-Ming Chang
Journal of Medical Sciences.2021; 42(1): 46. CrossRef

Erdheim-Chester Disease Involving Lymph Nodes and Liver Clinically Mimicking Lymphoma: A Case Report: Yeoun Eun Sung, Yoon Seo Lee, Jieun Lee, Kyo Young Lee; J Pathol Transl Med. 2018;52(3):183-190. Published online December 27, 2017; DOI: https://doi.org/10.4132/jptm.2017.10.16

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Abstract PDF

Erdheim-Chester disease (ECD) is a rare non-Langerhans cell histiocytosis and multisystem disease. First described in 1930, there are no more than 750 cases reported. The etiology remains unknown, but a majority of cases of ECD and Langerhans cell histiocytosis were found to have clonal mutations involving genes of the mitogen-activated protein kinase pathway. We recently encountered a 53-year-old male patient with extensive ECD involving the systemic lymph nodes, pleura, liver, and long bones clinically mimicking malignant lymphoma. Biopsies were performed at multiple sites, including a pleural mass, an external iliac lymph node, bone marrow, and the liver. Based on histopathological and immunohistochemical findings of positivity for CD68 and negativity for CD1a and S-100, the patient was diagnosed with ECD. Interferon-α was administered as the first-line treatment, but the patient rapidly progressed to hepatic failure after 2 months of treatment. We report this rare case of ECD clinically mimicking malignant lymphoma and diagnosed by careful pathological review.

Citations

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Pleuropulmonary Involvement in Erdheim–Chester Disease
Steven Tessier, Aldo A. Acosta-Medina, Brandon T. Larsen, Jason R. Young, Ronald S. Go, Jay H. Ryu
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Erdheim Chester Disease Mimicking Lymphoma: A Case Report
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Erdheim–Chester Disease with Isolated CNS Involvement: A Systematic Review of the Literature
Anam Haque, Carlos A. Pérez, Thejasvi A. Reddy, Rajesh K. Gupta
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Erdheim‐Chester disease with long‐standing diabetes insipidus and generalized edema
Faezeh Sadat Naji, Minoo Sadat Hajmiri, Zahra Mazari, Faeze Salahshour, Vahid Soleimani, Manouchehr Nakhjavani, Mahboobeh Hemmatabadi
Clinical Case Reports.2021;[Epub] CrossRef
Morbus Erdheim-Chester
J. Knitza, E. Kampylafka, J. Wacker, G. Schett, B. Manger
Zeitschrift für Rheumatologie.2019; 78(1): 66. CrossRef
New causes of hypophysitis
Kevin C.J. Yuen, Vera Popovic, Peter J. Trainer
Best Practice & Research Clinical Endocrinology & Metabolism.2019; 33(2): 101276. CrossRef
Primary Necrobiotic Xanthogranulomatous Sialadenitis with Submandibular Gland Localization without Skin Involvement
Myunghee Kang, Na Rae Kim, Dong Hae Chung, Jae Yeon Seok, Dong Young Kim
Journal of Pathology and Translational Medicine.2019; 53(4): 261. CrossRef
Interferon-α

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Merkel Cell Carcinoma Metastatic to Pleural Fluid: A Case Report: Ye-Young Rhee, Soo Hee Kim, Eun Kyung Kim, Se Hoon Kim; J Pathol Transl Med. 2018;52(3):206-209. Published online November 23, 2017; DOI: https://doi.org/10.4132/jptm.2017.11.10

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Abstract PDF

Merkel cell carcinoma (MCC) is a rare aggressive neuroendocrine carcinoma of the skin that shows locoregional or distant metastasis. Metastasis of MCC to body cavity effusion is extremely rare; only three cases have been reported so far. Metastatic MCC in effusion cytology shows small blue round cells with fine stippled chromatin like other small blue round cell tumors such as small cell lung carcinoma or lymphoma. The diagnosis of metastatic MCC can grant patients good chances at recently advanced therapeutic options. Here, we present a case of metastatic MCC to pleural effusion with characteristic single file-like pattern.

Citations

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Pleural Metastasis of Merkel Cell Carcinoma
Sina Maghsoudlou, Marc Pusztaszeri, Mauro Saieg
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Merkel cell carcinoma presenting as a malignant pleural effusion post‐COVID‐19 hospitalization: A case report and literature review
Joel Lanceta, Mesut Toprak, Oana C. Rosca
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Cytology coupled with immunocytochemistry identifies Merkel cell carcinoma: A rare intruder in the cerebrospinal fluid
Reetu Kundu, Brijdeep Singh, Pranab Dey
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Derrame pleural por carcinoma de células de Merkel
María J. Soler-Sempere, María O. Alvárez-Fernández, Isabel Padilla-Navas, María Cabezas-Macián, Jose F. Sánchez-Hernández, Eduardo García-Pachón
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A rare case of pleural localisation of both metastatic Merkel cell carcinoma and chronic lymphocytic leukaemia
Elise Kaspi, Shirley Fritz, Julien Colle, Florent Amatore, Diane Frankel, Patrice Roll
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Merkel cell carcinoma with pleural effusion
María J. Soler-Sempere, María O. Alvárez-Fernández, Isabel Padilla-Navas, María Cabezas-Macián, Jose F. Sánchez-Hernández, Eduardo García-Pachón
Archivos de Bronconeumología (English Edition).2021; 57(11): 715. CrossRef

Brief Case Report

Primary Leiomyosarcoma of Adrenal Gland with Tissue Eosinophilic Infiltration: Seungkoo Lee, Gail Domecq C. Tanawit, Rolando A. Lopez, Jaime T. Zamuco, Betsy Grace G. Cheng, Menandro V. Siozon; Korean J Pathol. 2014;48(6):423-425. Published online December 31, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.6.423

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Primary adrenal leiomyosarcoma
Syed Muhammad Nazim, Muhammad Hummam Siddique, Imran Khan Jalbani, Ayesha Nusrat
BMJ Case Reports.2025; 18(10): e266476. CrossRef
Outcomes and Follow-Up Trends in Adrenal Leiomyosarcoma: A Comprehensive Literature Review and Case Report
Federico Maria Mongardini, Maddalena Paolicelli, Antonio Catauro, Alessandra Conzo, Luigi Flagiello, Giusiana Nesta, Rosetta Esposito, Andrea Ronchi, Alessandro Romano, Renato Patrone, Ludovico Docimo, Giovanni Conzo
Journal of Clinical Medicine.2024; 13(12): 3499. CrossRef
Challenges in the diagnosis of the enigmatic primary adrenal leiomyosarcoma: two case reports and review of the literature
Sawako Suzuki, Naoya Takahashi, Masafumi Sugo, Kazuki Ishiwata, Akiko Ishida, Suzuka Watanabe, Katsushi Igarashi, Yutaro Ruike, Kumiko Naito, Masanori Fujimoto, Hisashi Koide, Yusuke Imamura, Shinichi Sakamoto, Tomohiko Ichikawa, Yoshihiro Kubota, Takeshi
BMC Endocrine Disorders.2023;[Epub] CrossRef
Primary adrenal leiomyosarcoma: clinical case and literature review
S. V. Lukyanov, K. M. Blikyan, S. S. Todorov, V. Y. Deribas, N. S. Lukyanov
Endocrine Surgery.2021; 15(1): 36. CrossRef
Pleomorphic Leiomyosarcoma of the Adrenal Gland in a Young Woman: A Case Report and Review of the Literature

Yuanyuan Wang, Yongliang Teng, Shibo Na, Ye Yuan
OncoTargets and Therapy.2020; Volume 13: 4705. CrossRef
Primary Adrenal Leiomyosarcoma: Clinical, Radiological, and Histopathological Characteristics
Fatema Jabarkhel, Henri Puttonen, Lina Hansson, Andreas Muth, Oskar Ragnarsson
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Primary adrenal leiomyosarcoma with inferior vena cava extension in a 70-year-old man
Sai K Doppalapudi, Tejash Shah, Valerie A Fitzhugh, Vladislav Bargman
BMJ Case Reports.2019; 12(3): e227670. CrossRef
Primary Adrenal Leiomyosarcoma: An Extremely Rare Mesenchymal Tumor
D Lokanatha, Linu Abraham Jacob, MC Suresh Babu, KN Lokesh, Ram Krishna Sai, AH Rudresha, LK Rajeev, Smitha Saldanha, MN Suma, A Usha
Indian Journal of Medical and Paediatric Oncology.2019; 40(04): 559. CrossRef

Original Article

Pleural Mesothelioma: An Institutional Experience of 66 Cases: Soomin Ahn, In Ho Choi, Joungho Han, Jhingook Kim, Myung-Ju Ahn; Korean J Pathol. 2014;48(2):91-99. Published online April 28, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.2.91

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Abstract PDF

Background

Malignant mesothelioma of the pleura is an aggressive tumor known to be associated with asbestos. Histological diagnosis of mesothelioma is challenging and is usually aided by immunohistochemical markers.

Methods

During an 18-year period (1995-2012), 66 patients with pleural mesothelioma were diagnosed at the Samsung Medical Center in Seoul. We reviewed hematoxylin and eosin and immunohistochemical slides of pleural mesothelioma and evaluated their pathological and clinical features.

Results

The male-to-female ratio was 1.75:1, and age of patients ranged from 28 to 80 years with an average age of 56.84 years. Twenty-two out of 66 patients underwent curative pneumonectomy. Follow-up data was available in 60 patients (90.9%), and 50 of them (83.3%) died from the disease. The average overall survival was 15.39 months. Histologically, the epithelioid type was the most common, followed by the sarcomatoid and the biphasic types. Epidemiologic information was not available in most cases, and only one patient was confirmed to have a history of asbestos exposure.

Conclusions

Malignant mesothelioma of the pleura is a fatal tumor, and the therapeutic benefit of pneumonectomy remains unproven. The combination of calretinin, Wilms tumor 1, HMBE-1, and thyroid transcription factor-1 may provide high diagnostic accuracy in diagnosing mesothelioma.

Citations

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Expression of V-set immunoregulatory receptor in malignant mesothelioma
Yeon Seung Chung, Moonsik Kim, Yoon Jin Cha, Kyung A Kim, Hyo Sup Shim
Modern Pathology.2020; 33(2): 263. CrossRef
Is the pathology related to the amount of pleural thickening measured by thorax CT?
özgür katrancıoğlu, Tuba Sahinoglu, Kayhan Karakus, Ozan Kandemir, Semiha Urvay, Esra Aydın Karakaya, Nurkay Katrancioglu
Cumhuriyet Medical Journal.2018; 40(2): 157. CrossRef

Case Reports

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

Cytologic Diagnosis of Malignant Pleural Effusion in Multiple Myeloma: Two Case Reports.: Yoo Duk Choi, Sung Sun Kim, Chang Woo Han, Ji Shin Lee, Jong Hee Nam, Sang Woo Juhng, Chan Choi; Korean J Pathol. 2009;43(4):382-385.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.4.382

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Abstract PDF

Malignant pleural effusion in multiple myeloma (MM) is extremely rare and is associated with poor prognosis. We experienced two cases of MM IgA type with malignant pleural effusion. The diagnoses were based on characteristic cytology and CD138 immunocytochemistry. The patients received several cycles of combination chemotherapy, since symptoms were more aggressive with an uncontrolled pleural effusion. We review the clinical features of these cases and literature concerning myelomatous pleural effusion.

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Myelomatous pleural effusion: A rare case in posttransplant myeloma
Sudha Madhuri Kandikanti, Poojitha Reddy Byreddy
RMC Global Journal.2025; 1: 94. CrossRef
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V. Riveiro, L. Ferreiro, M.E. Toubes, A. Lama, J.M. Álvarez-Dobaño, L. Valdés
Revista Clínica Española.2018; 218(2): 89. CrossRef
Characteristics of patients with myelomatous pleural effusion. A systematic review
V. Riveiro, L. Ferreiro, M.E. Toubes, A. Lama, J.M. Álvarez-Dobaño, L. Valdés
Revista Clínica Española (English Edition).2018; 218(2): 89. CrossRef
A 76-Year-Old Man With Anemia, Bone Pain, and Progressive Dyspnea
Thitiporn Suwatanapongched, Prapaporn Pornsuriyasak, Wasana Kanoksil, Thotsaporn Morasert, Warapat Virayavanich
Chest.2014; 145(4): 913. CrossRef

The Cytology of Metastatic Angiosarcoma in Pleural Fluid : A Case Report.: Na Rae Kim, Dong Hae Chung, Hyun Yee Cho; Korean J Pathol. 2009;43(3):285-259.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.3.285

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Abstract PDF

A 74-year-old woman presented with an abrupt onset of dyspnea that she had experienced for a week. She had been suffering from cutaneous nodules in the scalp for a year. Thoracentesis of the pleural fluid was performed. The Papanicolaou-stained smears, Thin prep and cell block preparations revealed clusters of oval-shaped cells concentrically layered about amorphous acellular cores, i.e., there was microacinar lumen formation as well as singly scattered atypical cells. The cells occasionally demonstrated intracytoplasmic vacuoles and hemosiderin deposits. Those cells stained for CD31 and they were negative for pancytokeratin. Punch biopsy from the scalp nodules revealed angiosarcoma. There are currently few reported cases of angiosarcoma in an exfoliative pleural effusion. Angiosarcoma has diverse, heterogeneous cytologic features. Making the cytologic diagnosis of metastatic angiosarcoma in pleural fluid is a challenge for pathologists. Knowledge of the clinical history is of great help for diagnosing this tumor when it appears in rare sites. Immunopanels with CD31, pancytokeratin and TTF-1 are helpful for making the differential diagnosis. The pathologists should look for clues suggesting the presence of vascular differentiation in the exfoliative cytologic materials when a diagnosis of angiosarcoma is suspected.

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Metastatic pleural angiosarcoma: A diagnostic pitfall might be overcome by morphologic clues and clinical correlation
Ok Ran Shin, Uiju Cho, Eundeok Chang, Kyung Jin Seo
Diagnostic Cytopathology.2015; 43(8): 669. CrossRef
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Shiho KURODA, Shioto SUZUKI, Akira KURITA, Mari MURAKI, Fumihiko TANIOKA
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Fine Needle Aspiration Cytologic Findings of Angiosarcoma - Report of Two Cases -
Jin Xian Ji, Young Chae Chu, Lucia Kim, Suk Jin Choi, In Suh Park, Jee Young Han, Joon Mee Kim, Kyu Ho Kim, Ju Young Song
The Korean Journal of Pathology.2011; 45(2): 217. CrossRef

Original Article

Extrapleural Solitary Fibrous Tumor A clinical & pathological study of 8 cases.: Mi Kyung Lee, Dong Hwan Shin, Min Sun Cho, Yuon Mee Kim, Jin Kim; Korean J Pathol. 1999;33(2):108-114.

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Abstract: We reviewed eight solitary fibrous tumors occurring at sites other than pleura (three orbit, two retroperitoneum, one each hard palate, thyroid, and tongue) which shared the histologic and immunohistochemical features of solitary fibrous tumors of pleura. Six patients were women, and two were men, aged from 26 to 74 years. The tumors ranging from 1.5 to 19 cm in diameter presented as well-circumscribed, unencapsulated, soft to rubbery tissue masses. Histologically they were characterized by a proliferation of spindle or ovoid cells intervened by a dense bundles of collagen. A variety of growth patterns was identified but the so-called patternless pattern was the predominant one. One tumor exhibited highly cellular sarcomatous areas with extensive necrosis, which was diagnosed as malignant solitary fibrous tumor. Immunohistochemical studies showed that all of the tumors were strongly positive for both CD34 and vimentin, but negative for cytokeratin, S-100 protein, EMA, and desmin. One case examined ultrastructurally showed features of fibroblast. All but one showed no evidence of recurrence or metastasis over follow-up period of 14 to 32 months. We conclude that extrapleural solitary fibrous tumors represent a distinct mesenchymal tumor with variable histologic features and should be differentiated from other spindle cell mesenchymal tumors.

Case Report

Cytologic Features of an Angiosarcoma in Pleural Fluid: A Case Report .: Young Chae Chu, In Seo Park, Yoon Ju Kim, Hye Seung Han, Jee Young Han; J Pathol Transl Med. 1999;10(1):61-66.

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Abstract PDF: Angiosarcomas are rare tumors, seen most commonly in the skin and soft tissue of head and neck region. But it has been described in numerous body sites including thyroid, breast, liver, spleen, bone, etc.. Their biological behaviors depend on the microscopic grade, site of origin, and multifocality. We report the unique cytological features of an angiosarcoma in pleural fluid. A 61-year-old woman presented with a 6 month history of dyspnea on exertion and chest pain. Chest computerized tomography(CT) revealed multiple subpleural small nodules in the right lung and widespread air space consolidation and pleural effusion in the left lung. CT of liver revealed multiple small low attenuated lesion. The smears obtained from pleural fluid showed hypocellularity with a hemorrhagic background. The tumor cells were highly pleomorphic oval or spindle in shape and presented singly, in loose groups, in knitted syncytial aggregates, and in acinar pattern. Their nuclei had vesicular chromatin with delineated, thick nuclear membranes and occasionally a large eosinophilic, prominent nucleolus. The cytoplasm was plump, thin or projected in spindly fashion. Almost all tumor cells showed variable sized intracytoplasmic vacuoles and their nuclei were sometimes crescentic by a huge vacuole. Occasional binucleated tumor cells and mitotic figures were present. Cellular debris and streaky materials were identified. Needle biopsy specimen from the pleura revealed anastomosing slit-like spaces lined by pleomorphic tumor cells. The tumor cells showed a strong reactivity for CD31 and vimentin and focal weak reactivity for factor VIII-related antigen.

Original Article

Fine Needle Aspiration Cytology of Myxodi Chondrsarcoma of Pleura: A Case Report.: Na Hye Myong, Kyung Ja Cho, Ja June Jang, Jae Il Zo, Young Mog Shim; J Pathol Transl Med. 1990;1(2):152-157.

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Abstract PDF: A 70-year-old female who was diagnosed as myxoid chondrosarcoma by fine needle aspiration of a pleural mass is described. She presented with left chest discomfort of 4 months' duration and aggravating dyspnea and chest pain for 2 months. Chest X-ray and CT scan revealed a large lobulated low density mass invading chest wall at the left pleural cavity and massive pleural fluid. Fine needle aspiration was done under the impression of mesothelioma or metastatic cancer. The aspirates from the mass were very cellular and composed of isolated or clustered forms of large plump cells. Abundant cytoplasm was bluish opaque and the margin was rounded in the isolated cells, whereas clustered cells show ill-defined cell borders and aggregating tendency. The nuclei were eccentric, round to ovoid, and had fine chromatin pattern and multiple small nucleoli. Cellular pleomorphism or mitotic figure was not definite. These findings were consistent with cytologic features of chondrosarcoma. Final diagnosis was confirmed as myxoid chondrosarcoma by mediastinoscopic biopsy and the tumor showed strong positivity for S-100 protein.

Case Reports

Malignant Solitary Fibrous Tumor of the Pleura in Mediastinum.: Yun Kyung Kang, Hyun Joo Yoo, Ho Kee Yum, Hong Sup Lee; Korean J Pathol. 1997;31(4):351-356.

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Abstract PDF: Solitary fibrous tumors (SFTs) most often involve the pleura and also may encompass the peritoneum and nonserosal sites. They occur as solitary encapsulated tumors and pursue a relatively benign clinical course. The usual criteria for malignancy are high cellularity, mitotic activity (more than 4 per 10 high-power fields), cellular pleomorphism, hemorrhage and necrosis as well as infiltrative growth. We report a case of malignant SFT of pleura who presented with an anterior mediastinal mass. Grossly, it was a 10x8x6.5 cm sized, encapsulated and well-demarcated, solid neoplasm with areas of extensive necrosis. Microscopically, parallel or haphazard arrangement of spindle cells with variable degrees of collagenous background were noted. Storiform fascicle formation, hemangiopericytoma-like pattern, and epithelioid cell clusters were often intermingled. Nodular areas with high cellularity and mitotic activity (> or =10/10 HPFs) were scattered throughout the neoplasm, however no definite cellular pleomorphism was encountered. Tumor cells were immunoreactive for vimentin and CD-34, which distinguished them from the mesothelial cells. Electron microscopically, they revealed fibroblastic and myofibroblastic differentiation.

Fine Needle Aspiration Cytology of Solitary Fibrous Tumor of the Pleura: Report of a case misdiagnosed as denocarcinoma of lung.: Yoon La Choi, Young Lyun Oh, Mee Sook Lee, Jung Ho Han, Geung Hwan Ahn; J Pathol Transl Med. 2001;12(2):111-115.

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Abstract PDF: Solitary fibrous tumor of the pleura is rare but should be included in the differential diagnosis of a peripheral pulmonary nodule. Cytologic features of solitary fibrous tumor of the pleura is not familar to the pathologist and may be misdiagnosed as malignancy. We report fine needle aspiration cytologic(FNAC) findings of a case of solitary fibrous tumor misdiagnosed as adenocarcinoma in a 48-year-old woman. The FNAC displayed a mixture of bland-looking spindle cells and clusters of epithelioid cells, which have hyperchromatic nuclei with prominent nucleoli. The helpful finding to distinguish it from other circumscribed benign and malignant lesions is the presence of fibromyxoid matrix admixed with blood vessels and thin collagen fibers. Familiarity with these features is essential to avoid misdiagnosis and overtreatment.

Original Articles

Squamous Metaplasia of the Pleura.: Hyun Ju Kim, Jeong Hee Lee, Gyung Hyuck Ko; Korean J Pathol. 1995;29(6):792-793.

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Abstract PDF: We report a case of squamous metaplasia of the pleura observed in a 51 year old man. Squamous metaplasia of serosal surface, and in particular of the pleura, is uncommon. The pathogenesis of squamous metaplasia is obscure, but it may be associated with chronic irritation.

Cytologic Features and Distribution of Primary site of Malignant Cells in Body Fluids.: Kyoung Ho Kim, Kwang Gil Lee; Korean J Pathol. 1990;24(4):456-464.

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Abstract PDF: Many articles concerning the accuracy of diagnosis of malignant tumor cells in body fluids have appeared in the literature, but few authors have attempted to describe the characteristics of these cells to determine the site of the primary tumor as they relate to tumors of specific primary sites. This paper presents the results of a retrospective study on malignant body cavity effusions of which the primary site was established on the basis of either biopsy or surgical resection of the primary neoplasm during the period of 6 years beginning from January 1983 to December 1988. The results obtained are summarized as follows: 1) The 143 fluid specimens from 129 patients were composed of 51 cases of pleural, 69 of peritoneal, and 9 of pericardial origin. 2) Adenocarcinoma was the most frequent type of malignant effusions (78.3%). The most common primary site was the lung (50%) in pleural fluid and stomach (55.2%) in ascites. 3) The results of this study show that the primary site of tumor cells can be identified in the body fluid of accurate cytomorphologic criteria are used. Identification of the primary site of an effusion would be improved by the consideration of clinical information

A Pathological Review of Pleural Effusion by Immunocytochemical Methods.: Dong Hwan Shin, Hee Jeong Ahn, Woo Ick Yang, In Joon Choi; Korean J Pathol. 1990;24(4):476-481.

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Abstract PDF: An unequivocal diagnosis of mesothelioma during life, on the basis of limited biopsy tissue or cytological specimens, is frequently difficult and requires distinction from inflammatory mesothelial hyperplasia on the one hand and secondary neoplasms, especially adenocarcinoma on the other. Although some studies have produced conflicting results, it is generally believed that immunohistochemical methods can aid in this distinction. To obtain comparable and reproducible results, 23 metastatic carcinoma of the pleura and 2 unequivocal malignant epiehtlial mesotheliomas were studied by the peroxidase-antiperoxedase method on paraffin-embedded cell blocks, and commercially available antibodies to carcinoembryonic antigen (CEA), keratin and epithelial membrane antigen (EMA) were used. Nineteen metastaic adenocarcinoma (73%) and two mesotheliomas (100%) reacted with keratin and EMA antibodies. Nineteen matastatic adenocarcinomas (73%) reacted with EMA antibodies. Nineteen metastatic adenocarcinoma (73%) reacted with CEA antibody; no mesotheliomas stained for CEA. Two cases of reactive mesothlial hyperplasia showed positive for keratin, but negative reaction for EMA and CEA. Noen of the antibodies used in this study was specific for mesothelioma, but CEA was found to be the most useful marker for differentiating between mesothelioma and metastatic carcinoma.

Case Reports

Composite Epithelioid Hemangioendothelioma in Pleural Effusion Mimicking Metastatic Adenocarcinoma: Cytologic and Immunocytochemical Findings.: Ki Seok Jang, Hong Xiu Han, Moon Hyang Park; J Pathol Transl Med. 2003;14(1):36-41.

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Abstract PDF: Epithelioid hemangioendothelioma is a rare vascular tumor of borderline malignancy which is characterized by the presence of "epithelioid" or "histiocytoid" endothelial cells. Superficial and deep tumors have been recognized in the extremities, head, neck, chest, and mediastinum of adult patients. It may also occur as a primary tumor of liver, bone, and other visceral organs. Few effusion cytologic findings of epithelioid hemangioendothelioma have been reported. We report a case of composite epithelioid hemangioendothelioma with focal epithelioid angiosarcomatous areas of the iliac bone and adjacent soft tissue in a 38-year-old female, which, during its metastatic course, was presented as a pleural effusion. The effusion was cellular with epithelioid cells presenting both singly and in clusters. The tumor cells were round to ovoid showing cytoplasmic vacuolization, variability in cell size, and prominent nucleoli. The effusion smears and cell block sections revealed strong positive staining for CD31 and vimentin, weak positive for CD34 and Factor VIII-related antigen, and negative for cytokeratin, CEA, and calretinin. The cytologic findings in this case were similar to that of metastatic adenocarcinoma or malignant mesothelioma. Therefore, immunocytochemical staining in smear and cell block is a helpful tool to differentiate malignant "epithelioid" cells in effusion.

Cytologic Diagnosis of Malignant Fibrous Histiocytoma in Pleural Fluid: A Case Report.: Hwa Eun Oh, Yoo Hoon Kim, Seong Jin Cho, Young Sik Kim, In Sun Kim; J Pathol Transl Med. 1995;6(1):80-83.

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Abstract PDF: Malignant fibrous histiocytoma is the most common soft tissue sarcoma of late adult life, but it is rare in the pleura. We recently experienced a case of cytology of malignant fibrous histiocytoma in pleural fluid. The smear revealed histiocytic malignant cells, spindle malignant cells and inflammatory cells. The histiocytic cells showed abundant, pale cytoplasm and ovoid, irregular, eccentrically placed nuclei. The spindle cells showed elongated nuclei. Intercellular collagen was also present.

Original Article

Cytologic Analysis of Metastatic Malignant Tumor in Pleural and Ascitic Fluid.: Mee Joo, Hye Je Cho; J Pathol Transl Med. 1995;6(2):125-132.

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Abstract PDF: Cytodiagnosis of pleural and ascitic fluid is a commonly performed laboratory examination. Especially, positivity for malignant cells in effusion cytology is very effective and also presents the first sign of malignancy in unknown primary site of the tumor. We examined each 34 cases of pleural and ascitic fluid cytologic specimen diagnosed as metastatic tumor, which was selected among 964 pleural fluid cytology cases and 662 ascitic fluid cytology cases from September 1989 to June 1995. Among the ascitic fluid cytology specimens examined, 34 specimens were positive in 29 patients. The most common primary neoplasms were carcinomas of ovary (32%), stomach (32%), colon (6%), breast (3%), pancreas (3%), and lung (3%) and lymphoreticular neoplasms (3%). The metastatic tumor was predominantly adenocarcinoma type in both pleural (82%) and ascitic (91%) fluid. The study of metastatic adenocarcinoma in effusion from lung, ovary, and stomach was undertaken to find distinctive features for the identification of the primary site. The smears of metastatic pulmonary adenocarcinoma had a tendency to show high grade pleomorphism and many large tight cell clusters, whereas that of the ovarian adenocarcinoma showed low grade pleomorphism with abundant intracytoplasmic vacuoles in relatively clear background. That of the stomach revealed the intermediate features.

Case Reports

Effusion Cytology of Ki - 1 Positive Anaplastic Large Cell Lymphoma: A Case Report.: Mi Sook Lee, Mi Ja Lee, Yu Kyung Jeong, Sung Chul Lim, Keun Hong Kee, Ho Jong Jeon; J Pathol Transl Med. 1995;6(2):163-168.

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Abstract PDF: Ki-1 positive anaplastic large cell lymphoma is a newly described high-grade lymphoma and is defined by histopathological and immunologic criteria. We experienced a case of systemically involving Ki-1 positive anaplastic large cell lymphoma in a 44 year-old female which initially manifested as pleural effusion. Abdominopelvic CT scan showed the evidence of marked lymphadenopathy in retroperitoneal and both external and inguinal lymph nodes. On cytologic examination of pleural fluid tumor cells revealed pleomorphic large isolated cells with prominent nucleoli and abundant cytoplasms. The nuclei were large with irregular profiles including some deep invaginations. Also. occasional multilobed/multinucleated and binucleated nuclei were seen. Immunohistochemical examination was performed to differentiate from the undifferentiated adenocarcinoma. Hodgkin's disease, non-Hodgkin's lymphoma and malignant histiocytosis. The neoplastic cells were positive for leukocyte common antigen. CD3 CD30(ki-1) but negative for cytokeratin. epithelial membrane antigen. and CD15. A histologic diagnosis of Ki-1 positive anaplastic lymphoma was made by biopsies of the inguinal lymph node, polypoid lesion of the stomach and cecum.

Cytologic Findings of Rheumatoid Pleuritis in Pleural Effusion: A Case Report .: Hee Jeung Cha, Soo Kee Min, Joon Mee Kim, Young Chae Chu; J Pathol Transl Med. 1997;8(1):47-51.

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Abstract PDF: Patients with rheumatoid arthritis of any degree of severity or duration may develop necrotizing granulomatous pleuritis, a morphologic replica of the inflammatory reaction characteristic of rheumatoid synovitis and rheumatoid nodules. The principal feature is the background composed of granular, amorphous, particulate material or debris of various hues. The material is sometimes eosinophilic, sometimes more cyanophilic, or even green in the Papanicolaou stain. Within this background are elongated, fibroblast-like epithelioid cells, numerous multinucleated giant cells and degenerating leukocytes. The combination of the debris, spindle epithelioid cells, and multinucleated giant cells in fluid is pathognomonic for rheumatoid pleuritis. We experienced a hcase of rheumatoid pleuritis showing these characteristic cytologic findings. The patient was a 63 year-old man with positive rheumatoid factor. The pleual fluid specimen revealed elongated epithelioid cells and multinucleated giant cells in a background of amorphous granular material.

Rounded Atelectasis: A Brief Case Report.: Gou Young Kim, Ji Young Park, Joung ho Han, Tae Seong Kim, Jhin gook Kim; Korean J Pathol. 2003;37(4):279-281.

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Abstract PDF: Rounded atelectasis is a focal, pleural-based lesion that is the result of pleural and subpleural scarring and atelectasis of the adjacent lung tissue. We experienced a case of asbestosassociated rounded atelectasis that had developed in a 50-year-old male. When examined with routine chest radiography, the patient was shown to have an asymptomatic chest mass.Computed tomography showed a pleural-based mass with a curvilinear shape about 4.2 cmin greatest diameter in the medial basal segment of the right lower lobe. To exclude the possibilityof malignancy the mass was excised by video-assisted thoracotomy. The mass wasround and firm, and was gray and yellow in color. Microscopically, marked pleural fibrosisextended into the underlying lung parenchyme and then resulted in atelectasis. There areferruginous bodies in dense fibrous pleura.

Original Article

Pleural Effusion Cytology of the Metastatic Sex Cord Tumor With Annular Tubules.: Sun Lee, Ju Hie Lee, Youn Wha Kim, Yong Koo Park, Hak Soon Chang, Moon Ho Yang; J Pathol Transl Med. 1997;8(2):190-193.

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Abstract PDF: The sex cord tumor with annular tubules(SCTAT) is a rare ovarian neoplasm, which charateristically shows simple and complex annular tubules with central acidophilic hyaline bodies. This tumor has been considered as a tumor of low-grade malignancy with late recurrence. We presented a brief case report of metastatic SCTAT of ovary in pleural fluid from ovary with cytopathologic and clinical features. The cytologic features of differential diagnosis are discussed.

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