We performed transurethral fulguration of the diverticular mucosa and incision of the diverticular neck in combination with transurethral prostatectomy or bladder neck resection to treat all aspects of diverticula in 9 patients. Eight cases with bladder outlet obstruction, involving 2 cases of large diverticula, have been successfully treated. A case with neurogenic bladder has failed. We found the transurethral procedure to be equally effective as open operation.