Urethral stricture, bladder neck spasm, dysfunction of bladder and rudimental gland are main causes which lead to obstructive voiding symptoms in postoperative BPH.

• 尿道狭窄，膀胱颈挛缩，腺体残留，膀胱功能异常是良性前列腺增生术后排尿困难的常见原因。