Some patients with cavernous hemangiomas can remain asymptomatic for the rest of their lives. A cavernous hemangioma is an abnormal vascular mass composed of many thin-walled blood vessels that resemble sponges in profile, hence the name cavernous hemangioma. Cavernous hemangiomas can occur anywhere in the body, such as the head, face, mucous membranes, vulva, extremities, trunk, intracranial, spinal cord, and liver. When cavernous hemangiomas do not bleed they can remain asymptomatic or undetected for the rest of their lives, or some of the smaller cavernous hemangiomas of the mucous membranes bleed less or are located in a relatively safe place and do not cause associated symptoms. While some cavernous hemangiomas may remain asymptomatic for the rest of their lives, there are specific locations where cavernous hemangiomas can cause serious symptoms, such as hemiplegia and other serious consequences of bleeding from cavernous hemangiomas in the intracranial functional areas. It is important to treat and monitor cavernous hemangiomas as directed by your doctor when they are detected.