Cytology of sclerosing epithelioid fibrosarcoma in pleural effusion.

We report a case of sclerosing epithelioid fibrosarcoma focusing on its cytological features in pleural effusion. A 32-year-old man had noticed a tumor in his left buttock 5 years earlier but had not sought treatment because the tumor had been painless. He visited our hospital because the tumor had gradually increased in size.