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膈腔生殖芽细胞瘤为罕见之瘤，为良成熟畸胎瘤及包含精细胞瘤和非精细胞瘤在内的恶瘤。