Urodynamic studies in boys with disorders of the lower urinary tract. V. Posterior urethral folds. A pre- and postoperative study.

Urodynamic investigation was performed in 21 boys with posterior urethral folds. An abnormal micturition pattern characterized either by varying degree of obstruction during the course of a micturition or by constant obstruction of "stricture type" was found in nine cases. The obstruction was generally of moderate degree. No micturition pattern specific for posterior urethral folds could be shown. Ten boys had enuresis. They did not differ from the other boys in regard to urodynamic variables. On the basis of clinical indications, 16 of the boys were operated on. Postoperative urodynamic follow-up indicated definite improvement or complete normalization in most of them, though urethral resistance was slightly increased postoperatively in three cases. Patients with posterior urethral folds probably should be treated by transurethral resection only if urodynamic investigation reveals an obstruction.