Asynchronous adenoid cystic carcinoma of the prostate and transitional cell carcinoma of the urinary bladder.

Histologic variants of prostatic carcinoma are readily recognized. In this report, we describe a rare variant, adenoid cystic carcinoma, in a 75-year-old man previously diagnosed to have transitional cell carcinoma of the urinary bladder. The diagnosis of adenoid cystic carcinoma was made by the characteristic microscopic features of the tumor morphologically and immunohistochemically. Two months later he was found to have metastatic disease. The patient's treatment consisted of chemotherapy in combination with prednisone and hormonal therapy. Five and a half months after diagnosis, he died with metastatic disease. Making this case unique is the asynchronous occurrence of this variant with transitional cell carcinoma of the urinary bladder, which has never been reported in the literature. We discussed the histopathologic and immunohistochemical features of adenoid cystic carcinoma of the prostate with review of literature.