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临床上未触及的隐睾的发生率大约占未降睾丸的20％(14～43％)。在隐睾中,单侧无睾(单睾症)约占4％左右,以左侧为多见。双侧无睾(无睾症)只占隐睾的0.6％。
Clinically unexplained cryptorchidism accounts for about 20% of undead (14-43%). In cryptorchidism, unilateral testicular (monomorphism) accounts for about 4%, to the left is more common. Bilateral non-testicular (no testis) accounts for only 0.6% of cryptorchidism.