A Case of Recurrent Rectal Cancer in the Rare Form of Bladder Cancer

A 49-year-old man visited the Department of Urology at our hospital with hematuria and pollakisuria. He was diagnosed with a rectal carcinoma and bladder invasion and was referred to the Department of Surgery. We performed a low anterior resection and partial resection of the bladder with a D3 lymph node dissection. The pathological diagnoses were tub1, SI, int, INFb, ly1, v0, N1, H0, M0, P0, and Stage IIIa, and the resection margin of the bladder was free. However, the patient continued to have hematuria 1 year and 9 months after the operation. A computed tomography scan showed a tumor from the bladder to the prostate. We suspected bladder carcinoma and performed a biopsy. The pathological diagnosis was a well differentiated adenocarcinoma, and we considered it a recurrence of the rectal carcinoma. We resected the bladder and prostate with an iliopelvic lymphadenectomy. The residual tumor did not histologically exist in the last cystectomy margin but was located on the other side apart from the margin. Based on the histology, the bladder tumor was considered a recurrence of the rectal carcinoma by intravesical peritoneum dissemination.