What is the term for a malignant neoplasm composed of blood vessels?

The term for a malignant neoplasm composed of blood vessels is "hemangiosarcoma." This type of cancer arises from the endothelial cells that line blood vessels and is characterized by the uncontrolled growth of these cells. Hemangiosarcoma can occur in various parts of the body, including the skin, soft tissues, and internal organs.

The name itself indicates its origin: "hema" refers to blood, and "sarcoma" denotes a malignant tumor that originates from connective tissues. Understanding this term is crucial in pathology and oncology, as it helps differentiate between various types of tumors based on their tissue of origin and behavior.

In contrast, angiosarcoma is a broader term that also signifies a malignant vascular tumor but can encompass various subtypes that may not be distinctly identified as hemangiosarcoma. Hemangioma, on the other hand, refers to a benign tumor made up of blood vessels, which does not exhibit the malignant characteristics of hemangiosarcoma. Lastly, carcinosarcoma is a type of cancer that involves both carcinomatous (epithelial) and sarcomatous (connective tissue) components but does not specifically relate to blood vessels. This understanding underscores the specific characteristics and definitions of the terms involved