[Ureteral Cancer Occuring in an Adult Megaureter : A Case Report].

A 86-year-old man visited our hospital to undergo a careful examination for asymptomatic gross hematuria. First, we performed cystoscopy and found a tumor projecting from the right ureteral orifice. We therefore performed computed tomography, which revealed right ureteral cancer projecting into the lower ureter and severe megaureter on bothsides. To evaluate the left megaureter, we performed retrograde pyelography, but were unable to insert a guide-wire. We therefore performed magnetic resonance-urography, which revealed an expanded left lower ureter, but no findings of hydronephrosis or any tumor lesions. Based on the findings of these examinations, we diagnosed the patient with right ureteral cancer with megaureter. Right nephroureterectomy and partial cystectomy were performed in April 2017. The pathological findings resulted in a diagnosis of invasive urothelial carcinoma. The patient experienced recurrence in his bladder at 3 months follow-up cystoscopy and underwent transurethral resection of bladder tumor.