后尿道符膜症是引起男性儿童下尿路梗阻、慢性肾衰而直接危及生命的一种先天性畸形，临床少见。我院自1956年以来收治3例，现报告如下。例1男，5个月。因患儿经常啼哭，每当排尿时尤为明显，尿呈滴沥状，发现下腹部包块而来院就诊。体检：发育较差，双肾均明显肿大，膀脱充盈达 Posterior urethral amnioplasty is a congenital deformity that is directly endangering life in lower urinary tract obstruction and chronic renal failure in male children. Our hospital since 1956 admitted to 3 cases, are as follows. Example 1 male, 5 months. Due to children often cry, especially when urinating is particularly obvious, urine drop drip and found the lower abdomen mass from the hospital. Physical examination: poor development, both kidneys were significantly enlarged, bladder off filling full