患者男性,22岁。因第三脑室下部占位性病变手术。病理诊断为第三脑室胚生殖细胞瘤。本文讨论了肿瘤的组织来源及其临床病理表现,我们认为它起源于生殖细胞的肿瘤,故命名为胚生殖细胞较为合适。该肿瘤的临床和病理均表现为恶性,手术难以彻底切除,且易复发和转移,预后不良,但肿瘤细胞对放射线很敏感。 Male patient, 22 years old. Due to the third ventricle space occupying lesion surgery. Pathological diagnosis of the third ventricle germ cell tumor. This article discusses the source of the tumor tissue and its clinicopathological manifestations, we think it originated in germ cell tumors, so named embryonic germ cells more appropriate. The clinical and pathological features of the tumor are malignant, it is difficult to completely remove the operation, and the recurrence and metastasis are easy. The prognosis is poor, but the tumor cells are sensitive to radiation.