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小儿睾丸原发恶性肿瘤是比较罕见的肿瘤,约占日本小儿全部恶性肿瘤的2～7%。一般都发生在二岁以下的幼儿。近年来,由于肿瘤标记物研究的进步,使肿瘤的病理及治疗有所发展。睾丸肿瘤分胚胎细胞性肿瘤及非胚胎细胞性肿瘤两大类,前者占大多数。按Dexon 分类,有精原细胞瘤、胚胎癌、畸胎瘤、绒癌及混合型五种,目前广泛使用的是这个分类。近年来,因为已知卵黄囊产生AFP;能产生AFP的睾丸肿瘤叫作卵黄囊肿瘤,如胚胎癌、恶性畸胎瘤
Pediatric testicular primary malignant tumors are relatively rare tumors, accounting for about 2% to 7% of all malignant tumors in Japanese children. It usually happens in children under the age of two. In recent years, due to advances in the study of tumor markers, the pathology and treatment of tumors have progressed. Testicular tumors are divided into two major groups: embryonic cell tumors and non-embryonic cell tumors, with the former accounting for the majority. According to the Dexon classification, there are five types of seminoma, embryonal carcinoma, teratoma, choriocarcinoma, and mixed type, which are widely used today. In recent years, it has been known that yolk sac produces AFP; testicular tumors that produce AFP are called yolk sac tumors, such as embryonal carcinoma and malignant teratoma.