Urinary Bladder Diseases [Disease/Finding] Urinary Bladder Neck Obstruction [Disease/Finding] N0000000563 1023806 Bladder Neck Obstruction Bladder Outlet Obstruction C0005694 Blocked urine flow through the bladder neck, the narrow internal urethral opening at the base of the URINARY BLADDER. Narrowing or strictures of the URETHRA can be congenital or acquired. It is often observed in males with enlarged PROSTATE glands. M0002634 399072004 Urinary Bladder Neck Obstruction D001748 C1304 Urinary Bladder Neck Obstruction Urethral Obstruction [Disease/Finding]