克兰菲特综合征(以下简称克氏征),亦称先天性睾丸发育不全症,较少见,且易漏诊、误诊,现报告1例。患者男性,20岁,未婚,汽车司机。因发现阴茎及睾丸小3年而入院。3年前自己发觉阴茎及睾丸偏小,伴体力差,易疲劳,阴茎少勃起及射精,无明显性欲,但智力尚好,能胜任本职。既往未患过腮腺炎。体检:体型瘦长无力(身高178cm,体重52kg), Cranfocus Syndrome (hereinafter referred to as Kirschner Sign), also known as congenital testicular hypoplasia, less common, and easy to misdiagnosis, misdiagnosis, is reported in 1 case. Patient Male, 20 years old, single, car driver. Because of penis and testicles found for 3 years and admitted to hospital. 3 years ago found himself penis and testicles smaller, with poor physical strength, fatigue, less erectile penis and ejaculation, no obvious sexual desire, but intelligence is good, capable of their own. Never had mumps. Physical examination: body length and weakness (height 178cm, weight 52kg),