[Histopathological study of secondary ureteral tumors occurring in 4 cases of bladder tumors].

Ureteral tumors were found in 4 out of 88 patients with bladder tumors who had been followed up at our clinic between July 4, 1984 and June 30, 1986. Radical nephroureterectomy and partial cystectomy were performed in 3 of them, and transurethral resection in the remaining one. The pathogenesis of the secondary ureteral tumors was discussed from the standpoints of implantation by vesicoureteral reflux, multicentricity, lymphatic or vascular spread and direct extension along the mucosa in these 4 cases. The ureteral tumor might have occurred in cases with multiple, recurrent or high grade bladder tumors and in cases with bladder tumors suffering from vesico-ureteral reflux. This study suggests that urine cytology, cystoscopy, retrograde cystography and excretory urography might be necessary in the cases of bladder tumors that had been treated with surgery with bladder preserved.