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[A Case of Urachal Carcinoma Treated with Laparoscopic Resection of Urachal Remnants with Partial Cystectomy that was Difficult to Diagnose Preoperatively by Transurethral Biopsy].

A 42-year-old male was referred to our hospital with the main complaint of gross hematuria. A submucosal tumor was found on top of the bladder dome. A cystoscopy and magnetic resonance image also revealed a urachal cyst at the position of the urachus. We performed a transurethral biopsy and the pathological examination was negative for malignancy. We executed laparoscopic urachal resection and partial cystectomy as well. The final pathological diagnosis was urachal carcinoma. It is difficult to diagnose urachal carcinoma accuratelyprior to the operation. Therefore, it is controversial whether a transurethral biopsyis necessaryor not. Surgical procedures should be planned with the suspicion of a malignant tumor.