English: What are vascular tumors? Vascular tumors are usually the result of blood vessel endothelial cell growth, and can be benign or malignant, and often manifest as lesions on the skin. This video covers three types of vascular tumors—Kaposi sarcoma, hemangioma (including cavernous hemangiomas, capillary hemangiomas, and pyogenic granulomas), and angiosarcoma. It also covers the common clinical signs and treatment.