内胚窦瘤亦称卵黄囊瘤,主要发生于性腺(睾丸、卵巢),发生于性腺外者少见,本院曾收治3例,报告如下。病例介绍例1、患者女,1岁半。下腹部出现肿物半年,初如枣大,近3个月迅速长大而入院。体检:脐下腹壁触及一成人拳头大的肿物,不活动。外生殖器及其它部位均无异常。手术探查:肿物位于腹壁肌层内,5×4×3cm大,包膜不完整与周围组织界限尚清,子宫及双附件未见异 Endodermal sinus tumors, also known as yolk sac tumor, occurs mainly in the gonads (testis, ovary) occurred in gonads outside the rare hospital had admitted to 3 cases, the report is as follows. Case introduction example 1, female patient, 1 year and a half. The lower abdomen appeared in the tumor for six months, beginning as jujube, nearly 3 months and grew up quickly admitted to hospital. Physical examination: an abdomen below the belly button touched an adult fist large tumor, not active. External genitalia and other parts are normal. Surgical exploration: the tumor is located in the abdominal wall muscle, 5 × 4 × 3cm large, incomplete envelope and surrounding tissue clear, uterus and double attachment no difference