A rare synchronous of dual primary genitourinary carcinoma manifested with a rapidly progressive renal failure.

Non-urothelial carcinoma accounts for <5% of urinary bladder tumors, and primary bladder adenocarcinoma accounts for 0.5-2%, but the variant primary signet-ring cell is extremely rare. We present a rare case of a synchronous of dual primary malignancy from a rare variant of urinary bladder adenocarcinoma (signet-ring cell) with indolent prostate adenocarcinoma in a 61-year-old male.