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罕见之，一般分良性成熟畸胎及包含精和非精在内的恶性。