Cavernoma, also known as cavernous angioma, cavernous hemangioma and cerebral cavernous malformation (CCM), is a condition consisting of clusters of abnormally dilated thin-walled blood vessels. The clumped blood vessels are most often found in the brain and spinal cord; far fewer are found in other parts of the body including the skin and the retina of the eye.
Sometimes patients have only one of these clumps but sometimes they may have several. The size of the lesions can vary, ranging from being barely visible to the naked eye to a few inches in diameter.
Cavernomas are often described as looking like a raspberry because they are made up of many bubble-like structures called caverns that are filled with blood. The bubble-like caverns are grossly dilated thin-walled vessels that leak due to defects in their walls.