thyroid gland angiosarcoma (MONDO_0003027) is a usually aggressive malignant vascular tumor primarily involving the thyroid gland. It is often associated with longstanding nodular goiter. Also known as: angiosarcoma (disease) of thyroid gland, angiosarcoma of the thyroid, angiosarcoma of the thyroid gland, angiosarcoma of thyroid, angiosarcoma of thyroid gland, hemangiosarcoma of the thyroid, hemangiosarcoma of the thyroid gland, hemangiosarcoma of thyroid.