隐睾症系指在胎儿期睾丸未能按照正常发育过程从腰部腹膜后下降,导致一侧或双侧睾丸未能正常下降至同侧阴囊内,又称睾丸下降不全,是小儿最常见的男性生殖系统先天性疾病之一。隐睾症在足月新生儿中的发病率约为2%~4%~([1]),是男性不育和睾丸肿瘤的重要危险因素。睾丸通常从怀孕的第28周开始下降,一般大多数隐睾在出生时或者婴儿早期被发现。临床上隐睾表型各异:腹腔型、腹股沟管型、阴囊高位隐睾、异位隐睾等。性腺在分化之前位于肾周,被背侧和腹侧 Cryptorchidism refers to the testis in the fetus failed to follow normal development from the waist retroperitoneal descending, resulting in one or both sides of the testicles failed to normal fall to the ipsilateral scrotum, also known as testicular descent, is the most common pediatric men One of the congenital diseases of the reproductive system. The incidence of cryptorchidism in full-term newborns is about 2% to 4% ~ ([1]), male infertility and testicular cancer is an important risk factor. Testicles usually decline from the 28th week of pregnancy, the majority of cryptorchidism is generally found at birth or early in infancy. Clinically different phenotypes of cryptorchidism: abdominal type, inguinal canal type, high cryptorchidism of the scrotum, ectopic cryptorchidism. Gonads are located in the perirenal area, dorsolateral and ventral before differentiation