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doi: https://doi.org/10.4132/jptm.2018.05.08    [Epub ahead of print]
Malignant Pleural Effusion from Metastatic Prostate Cancer: A Case Report with Unusual Cytologic Findings
Jinyoung Jeon1, Tae-Jung Kim2, Hong Sik Park1, Kyo-Young Lee1
1Department of Hospital Pathology, Seoul St. Mary’s Hospital, Seoul, Korea
2Department of Hospital Pathology, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
Corresponding Author: Kyo-Young Lee ,Tel: +82-2-2258-1618, Fax: +82-2-2258-1627, Email: leekyoyo@catholic.ac.kr
Received: February 20, 2018;  Revised: April 24, 2018  Accepted: May 8, 2018.  Published online: June 7, 2018.
We present a case of 55-year-old man who complained of dyspnea and sputum for a month. He was an ex-smoker having a history of prostate cancer and pulmonary tuberculosis. Chest radiographs revealed small to moderate amount of bilateral pleural effusions. Pigtail catheters were inserted and drainage was performed. The pleural fluid contained malignant cells, arranged in large clusters and tightly cohesive groups. These cytologic findings could not with certainty be ascribed to prostate cancer. We performed immunocytochemical (ICH) panel studies to determine the origin of cancer metastasis. The immunostaining results were consistent with prostatic origin; positive for PSA, AMACR and Nkx 3.1. Pleural effusion associated with prostate cancer is known to be rare. To our knowledge, this is the first case report in Korea to describe cytologic features of malignant pleural effusion (MPE) associated with prostate cancer.
Key Words: Prostatic cancer; Metastasis; Pleural effusion, malignant
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