Fine needle aspiration cytology of prostatic adenocarcinoma metastatic to the lung confirmed by the immunoperoxidase technique.

Two cases of prostatic adenocarcinoma metastatic to the lung are presented. The prostatic origin of the metastatic carcinomas was confirmed by immunocytochemical demonstration of prostate-specific antigen and prostatic acid phosphatase in cellular samples obtained by fine needle aspiration of the pulmonary lesions.