内胚窦瘤(Endodermal Sinus Tumor)又称为卵黄囊瘤(Yolk Sac Tumor)是一种来源于生殖细胞的高发恶性的、病程短、予后差的肿瘤。过去由于对此瘤的认识不足,曾被称为中肾瘤、胚胎性癌、睾丸母细胞瘤等。近期国内外文献报道较多。据文献报告此瘤占卵巢恶性肿瘤的5.15～11.8％,而占原发性青年前期睾丸肿瘤的1/3～1/2。本文就其好发部位、组织发生和命名、 Endodermal Sinus Tumor, also known as Yolk Sac Tumor, is a high-grade, malignant, short-term, and post-malignant tumor derived from germ cells. In the past, due to lack of understanding of this tumor, it was once called neutronoma, embryonal carcinoma, testicular blastoma, and the like. Recent domestic and international literature reports are more. According to reports in the literature, this tumor accounts for 5.15 to 11.8% of malignant ovarian tumors and accounts for 1/3 to 1/2 of primary pre-neoplastic testicular tumors. This article is about its occurrence, organization, and naming.