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

摘要无生腺体侵犯之原发纵膈腔生胞为罕见之，一般分为良成熟畸及包含精胞和非精胞在内的恶。