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

摘无生殖腺体侵犯之原发性纵膈腔生殖芽细胞瘤为罕见之瘤，一般分为良性成熟畸胎瘤及细胞瘤和非细胞瘤在内的恶性瘤。