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A rare extragonadal germ cell tumor that arises from the mediastinum and is associated with the presence of a somatic-type malignant component. The somatic malignancy is usually a sarcoma (e.g., embryonal rhabdomyosarcoma, angiosarcoma, or leiomyosarcoma), adenocarcinoma, squamous cell carcinoma, adenosquamous carcinoma, or primitive neuroectodermal tumor. The prognosis is poor.
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