Cavernous angioma, also known as cerebral cavernous malformation (CCM), cavernous haemangioma, and cavernoma, is a vascular disorder that alternately has been classified as neoplastic or hamartomatous. It is characterized by grossly dilated blood vessels with a single layer of endothelium and an absence of neuronal tissue within the lesions. These thinly walled vessels resemble sinusoidal cavities filled with stagnant blood. Blood vessels in patients with CCM can range from a few millimeters to several centimeters in diameter. Most lesions occur in the brain, but any organ may be involved.