[IgG4-related idiopathic segmental ureteritis which was difficult to distinguish from ureteral cancer: a case report].

A 79-year-old woman was admitted with a chief complaint of gross hematuria, pollakisuria, lower abdominal pain. Urine cytology, intravenous pyelography, and cystoscopy were performed but showed no abnormal findings. About 6 months later, abdominal computed tomography (CT) revealed a 5cm long segment of ureteral narrowing with wall thickening, hydronephrosis, para-aortic lymph node swelling. Retrogradepyelography (RP) was done. Pelvic urine cytology was class IV. Under the clinical diagnosis of ureteral carcinoma and lymph node metastasis, a left nephroureterectomy with lymph node dissection was performed. The pathological diagnosis was IgG4-related idiopathic segmental ureteritis.