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

摘殖腺体侵犯之原发性纵膈腔殖芽细胞为罕见之，一般分为良性成熟畸胎含精细胞和非精细胞在内的恶性。