In the present report, we describe a patient with microcystic variant of urothelial carcinoma in urinary bladder. In March 2016, a 71-year-old man presented with bladder tumors found incidentally by ultrasonography. Cystoscopy and contrast-enhanced computed tomography (CT) revealed multiple invasive tumor of posterior wall, with a maximum diameter of 33 mm. Transurethral resection (TUR) of bladder tumors was performed. Pathological diagnosis was urothelial carcinoma, high grade, T2 or more. Invasive urothelial carcinoma was diagnosed and laparoscopic radical cystectomy with orthotopic neobladder was performed accordingly in April 2016. Pathological findings indicated a diagnosis of microcystic variant of urothelial carcinoma. At present, six months after surgery, the patient remains free of recurrence and metastasis. Here we review the characteristics of 4 microcystic variant of urothelial carcinoma cases reported in Japan.
Keywords: bladder cancer; microcystic variant; urothelial carcinoma.