A 67-year-old woman was referred to our hospital for cough and fever. Chest computed tomography (CT) showed some masses showing slightly enhanced effect in the pericardium. FDG-PET showed the accumulation of FDG in the masses. Thoracoscopic surgical biopsy was performed to establish the diagnosis. The histological study showed proliferation of short spindle-shaped cells surrounded by lymphocyte, and the spindle cells were immunohistochemically positive for cytokeratin AE1/AE3, WT-1, D2-40, CAM5.2, intelectin-1 and negative for CEA, TTF-1, napsin A, claudin-4, calretinin, MUC4, PAX8, CD30. These findings were compatible with epithelial pericardial malignant mesothelioma.
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