卵黄囊肿瘤(yolk Sac tumor)又称内胚窦肿瘤(endodermal sinus tumor),婴儿型胎胚性癌、睾母细胞瘤(orchioblastoma)等。这是近年来已获公认的一个肿瘤单元。卵黄囊肿瘤一名首先由Teilum(1959)提出。本瘤不太少见,属恶性范畴。主要见于性腺。发生于睾丸者多见于婴幼儿,其中两岁以内手术者予后较好。临床上通常表现为阴囊内无痛性肿块,逐渐增大,可伴有鞘膜积 Yolk sac tumor is also called endodermal sinus tumor, infantile embryo carcinoma, orchioblastoma. This is a tumor unit that has been recognized in recent years. One of the yolk tumor was first proposed by Teilum (1959). The tumor is not uncommon, is a malignant category. Mainly seen in the gonads. Occurred in the testis were more common in infants and young children, of which less than two years of surgery after surgery is better. Usually clinically manifested as painless mass within the scrotum, gradually increased, may be associated with hydrocele