The most frequent sites of prostate cancer metastases are the bone and lung. Pleural metastasis of prostate cancer is clinically rare. We report a case with solitary pleural thickening arising from the metastasis of prostate cancer. A 71-year-old man was referred to our hospital for further examination of pleural thickening detected during a chest computed tomography (CT) examination. A video-assisted pleural biopsy was performed. The pathological findings showed that the tumor cells had spread from the parietal pleura to adipose tissue around the costal muscles. The tumor cells were positive for prostate-specific antigen (PSA) and negative for calretinin, cytokeratin (Ck5/6) and D2-40. These findings suggested that the pleural lesion was a metastasis of the prostate cancer.
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