Malignant phyllodes tumor of prostate.

A case of malignant phyllodes tumor of the prostate, with clinical course of recurrence and pulmonary metastasis is described in a thirty-eight-year-old man. Histologically the tumor was characterized by a fibrosarcoma-like pattern with adjacent changes of fibroadenoma and phyllodes type of prostatic atypical hyperplasia. The pathology, histogenesis, differential diagnosis, and the role of immunohistochemistry in the diagnosis and demonstration of its components is reviewed.