卵黄囊瘤又称内胚窦瘤,是恶性度极高的肿瘤,最常见于性腺内(卵巢及睾丸),也可见于性腺外的身体正中线部位(例如外阴、阴道、子宫体、前列腺、骶前、骶尾部、腹后壁、肝、胃底、腹壁脐部、纵隔、松果 Yolk sac tumor also known as endodermal sinus tumor, is a highly malignant tumor, the most common in the gonads (ovaries and testes), but also found in the body outside the gonadal midline (such as the vulva, vagina, uterus, prostate, Sacral, sacrococcygeal, ventral posterior wall, liver, stomach fundus, abdominal umbilical, mediastinum, pineal