Primary mediastinal germ-cell tumors (GCTs) without gonadal involvement are rare and can be divided into benign mature teratoma and malignant seminoma or nonseminoma.

摘要无生腺体侵犯之原发性纵膈腔生胞瘤之瘤，一般分良性成熟畸胎瘤及包含精胞瘤和非精胞瘤在内的恶性瘤。