[Soft tissue sarcomas as a rare cause of pleural effusion]

Malignant disease is the cause of about 24% of all pleural effusions. They are caused mainly by lung and breast cancer. Three cases of pleural effusion caused by very rare neoplasm, soft tissues sarcoma are presented. In two of them the lesion found in the leg was observed for 4-14 month and not connected with the presence of pleural effusion. Difficulties in the histologic diagnosis of pleural sarcoma and of differentiating this tumour from mesothelioma are also presented.