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出生时,大约86％的睾丸已正常地降入阴囊,余者大部分将在一周岁内下降。在500个男性中约有1例发生隐睾。未下降睾发生的恶变率比正常下降睾丸高30～50倍。作者于1934～1976年间收治睾丸肿瘤1,152例,其中患隐睾癌的,有隐睾症病史及临床症状者有137例(占12％)。单侧或双侧隐睾者44例,其中24例表现为腹股沟肿瘤,14例下腹部肿瘤,6例肿瘤为正常下降的睾丸,其对侧为未下降的睾丸。其他已手术纠正的阴囊内睾丸患瘤93例,其中有同侧隐睾病史者86例,对侧有隐睾病史者7例。隐睾均系3～50年前纠正者,有58例系2～42岁时手术纠正的,11例在5～13岁时行激素治疗,24例在2～30岁时睾丸自行降入阴囊。
At birth, about 86% of testicles have been properly introduced into the scrotum, most of whom will fall within one year of age. Cryptorchidism occurs in about one in 500 males. Decreased testicular malignant degeneration than normal testicular 30 to 50 times higher. The authors treated 1,152 cases of testicular tumors from 1934 to 1976, of whom 137 had cryptococcal cancer with history of cryptorchidism and clinical symptoms (12%). 44 cases of unilateral or bilateral cryptorchidism, of which 24 cases showed inguinal tumors, 14 cases of lower abdominal tumors, 6 cases of normal tumor decreased testes, the contralateral side of the testis did not decline. Other surgical correction of scrotal testicular tumor in 93 cases, including a history of ipsilateral cryptorchidism in 86 cases, contralateral cryptorchidism history in 7 cases. Cryptorchidism were 3 to 50 years ago to correct, 58 cases of 2 to 42 years of age when surgery, 11 cases of 5 to 13 years old when hormone therapy, 24 cases of 2 to 30 years of age when the testicles into the scrotum .