MONDO_0003034 (mediastinum angiosarcoma) is a malignant vascular neoplasm arising from the mediastinum. Also known as: angiosarcoma (disease) of mediastinum, angiosarcoma of mediastinum, angiosarcoma of the mediastinum, hemangiosarcoma of mediastinum, hemangiosarcoma of the mediastinum, mediastinal angiosarcoma, mediastinal hemangiosarcoma, mediastinum angiosarcoma (disease).