卵巢内胚窦瘤是高度恶性的生殖细胞肿瘤,由于其肿瘤形态和大鼠胎盘的内胚窦相似,故称为内胚窦瘤。又按其组织发生、形态、生化及能产生甲胎球蛋白等特点,与人胚卵黄囊组织类似,也称为卵黄囊瘤。随着对卵巢内胚窦瘤认识的不断提高,以前曾被认为是罕见的这种肿瘤,近年来报道表明,它是女孩中最常见的卵巢恶性肿瘤之一。占卵巢恶性肿瘤的5～15％,占女性生殖细胞瘤的56％。此瘤多发生在少 Ovarian endodermal sinus tumor is a highly malignant germ cell tumor, because of its tumor morphology and placental endoplast sinus similar, it is called endodermal sinus tumor. According to its organization, morphology, biochemistry and can produce a fetuin and other characteristics, similar to the human embryonic yolk sac, also known as yolk sac tumor. With the rising awareness of ovarian endodermal sinus tumors, which has previously been considered a rare tumor of this kind, it has been reported in recent years that it is one of the most common ovarian malignancies in girls. Accounting for 5 to 15% of ovarian cancer, accounting for 56% of female germ cell tumors. This tumor occurred in less