内胚窦瘤（ｅｎｄｏｄｅｒｍａｌｓｉｎｕｓｔｕｍｏｒ，简称ＥＳＴ）又称卵黄囊瘤，属生殖细胞瘤的一个亚类。原发于小脑幕的ＥＳＴ非常罕见，我院遇见１例，报告如下：患者男性，２．５岁，因频繁呕吐，走路不稳１个月入院。头颅ＣＴ发现左后颅窝一等密度肿块，大小４．... Endodermal sinus tumor (endodermalsinustumor, referred to as EST), also known as yolk sac tumor, is a subclass of germ cell tumors. The primary EST in the cerebellum was very rare. One patient met in our hospital and reported the following: Male patient, 2.5 years old, was hospitalized for 1 month due to frequent vomiting and walking instability. Head CT scan of the posterior fossa of the first-degree density mass, size 4. ...