2岁以下幼儿的睾丸恶性肿瘤比较少见,尤其是睾丸胚胎癌和内胚窦瘤,国内外报道尚少。现将我院收治的3例报告如下:例1 2个月。出生时左睾丸略大,近两月迅速增大。无外伤及红肿。检查左睾丸约为4×4×3.5cm,质硬、光滑。透光试验(一)。临床诊断:左睾丸精原细胞瘤。于 Testicular malignancies are rare in children under 2 years of age, especially in testicular embryonic carcinoma and endodermal sinus tumor, which are still few reports at home and abroad. Now my hospital admitted 3 cases are as follows: Example 1 2 months. Left testicle slightly larger at birth, the rapid increase in recent two months. No trauma and swelling. Check the left testis is about 4 × 4 × 3.5cm, hard and smooth. Light transmission test (a). Clinical diagnosis: left testicular seminoma. in