Malignant Mediastinal Germ Cell Tumor with Associated Hematologic Malignancy

**Semantic type:** Neoplastic Process

**Definition:** An extragonadal non-seminomatous malignant germ cell tumor that arises from the mediastinum and is associated with a hematologic malignancy. The hematologic malignancies are clonally related to the malignant germ cell tumor and include acute leukemias, myelodysplastic syndromes, myeloproliferative neoplasms, and mastocytosis.

**Synonyms:** - Germ Cell Tumor with Associated Hematological Malignancy - Malignant Mediastinal Germ Cell Tumor with Associated Hematological Malignancy