[Clear Cell Variant of Invasive Urothelial Carcinoma of the Renal Pelvis: A Case Report].

A 74-year-old woman with gross hematuria for 3 months was referred to our hospital. Contrast-enhanced computed tomographic scan showed a mass on the upper-right renal calyx, and retrograde pyelography showed stenoses from the renal pelvis to the renal calyx infundibulum. We performed an endoscopic biopsy, which led to a diagnosis of urothelial cancer. Therefore, she underwent total right nephroureterectomy, and pathological examination revealed a clear cell variant of invasive urothelial carcinoma. Irradiation was performed mainly on the renal arteriovenous stump 2 months postoperatively; subsequently, three courses of combination chemotherapy comprising gemcitabine plus cisplatin (GC) were administered. Port-site recurrence and pelvic recurrence were observed 22 months after the operation, and GC therapy and pembrolizumab were administered. However she died 36 months after the operation. The clear cell variant of invasive urothelial carcinoma of the upper urethra is rarely reported. Moreover, since this was a very rare case, we have included a literature review in our report.