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

摘要无腺体侵犯原发性纵膈芽细胞瘤为罕瘤，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瘤。