恶性卵黄囊瘤,又名内胚窦瘤,是一种起源于生殖细胞的高度恶性肿瘤。在临床和病理上常易漏诊或误诊近年我科遇12例,现将病理诊断等分析如下 1 临床资料 12例中男2例,女10例,年龄在4～27岁间,平均年龄15岁,多见青少年。发生部位卵巢10例,其中双侧1例,睾丸2例。症状出现至就诊时间在7天～9个月,平均为3个月。主要症状有腹部及睾丸肿块、腹 Malignant yolk sac tumor, also known as endodermal sinus tumor, is a highly malignant tumor that originates from germ cells. In the clinical and pathological often misdiagnosed or misdiagnosed in our department met 12 cases in recent years, now the pathological diagnosis and analysis are as follows 1 Clinical data 12 cases in 2 males and 10 females, aged 4 to 27 years old, mean age 15 years old , More common young people. Ovary occurred in 10 cases, including 1 case bilaterally and 2 cases of testis. Symptoms lasted from 7 days to 9 months, with an average of 3 months. The main symptoms are abdominal and testicular lumps, abdomen