A bony hemangioma can often be referred to as a few other names, primary intraosseous hemangioma or vascular hamartoma. A hemangioma is a benign vascular malformation that occurs when blood vessels multiply at an abnormal rate. They most commonly occur in the skull and the spine but they can form in any body part. Capillary and cavernous hemangiomas are the most common type of hemangioma to affect bones. The can occur on the surface of the bone or deeper. Often hemangiomas are asymptomatic and are found incidentally on an xray or MRI.