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A 65-year-old man was admitted to our clinic with the chief complaint of gross hematuria and burning on urination. Cystoscopy revealed a papillary broad base tumor on right lateral and posterior wall. Barium enema showed a tumor of sigmoid colon. The other gastrointestinal and genitourinary tracts were examined but no tumor lesion could be found. Total cystectomy and partial resection of sigmoid colon were done, and the urinary tract was reconstructed using a Kock continent ileal reservoir. Histological findings revealed adenocarcinoma of its infiltration to the sigmoid colon.

In recent years, because of advances in diagnostic techniques and therapy for malignant tumors, it is not rare to encounter cases of primary multiple malignant neoplasms. However, triple cancer is still rare. We report a case of triple cancer--gastric cancer, sigmoid colon cancer and malignant fibrous histiocytoma. To our regret, we could not make a diagnosis while the patient was alive. Careful examination of a cancer patient is important because malignant tumors may develop at any time.