Histological analysis of high-grade superficial bladder tumour.

Segmental cystectomy or total cystectomy was performed in 26 patients with newly diagnosed stage T1, grade 3 transitional cell carcinoma of the bladder. Their histological specimens were assessed with regard to types of tumour cell spread, small vessel involvement and coexistent carcinoma in situ. Patients were followed for 12 to 141 months. Broad front type and tentacular type spread were seen in 57.7% and 38.5%, respectively. Small vessel involvement was seen in 38.5% of patients. Coexistent carcinoma in situ was found in as many as 65.4%. Urethral recurrence was found in 4 patients out of 26. These data suggest that the high incidence of coexistent carcinoma in situ may be the most important cause of the unsatisfactory prognosis for stage T1, grade 3 bladder cancer.