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

• 摘要无生殖腺体侵犯之原发性纵膈腔生殖芽细胞肿瘤为罕见之肿瘤，一般分为良性成熟畸胎瘤及包含精细胞瘤和非精细胞瘤在内的恶性肿瘤。