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Cavernous hemangioma
Cavernous hemangioma, also called cavernous angioma, or cavernoma (often when referring to presence in the brain), is a type of blood vessel malformation or hemangioma, where a collection of dilated blood vessels form a tumor. Because of this malformation, blood flow through the cavities, or caverns, is slow. Additionally, the cells that form the vessels do not form the necessary junctions with surrounding cells. Also, the structural support from the smooth muscle is hindered, causing leakage into the surrounding tissue. It is the leakage of blood, known as a hemorrhage from these vessels that causes a variety of symptoms known to be associated with this disease.
==Cause==
Cavernous hemangiomas can arise nearly anywhere in the body where there are blood vessels and are considered to be benign neoplasms (noncancerous tumors). They are often described as raspberry like because of the bubble-like caverns. Unlike the capillary hemangiomas, they can be disfiguring and do not tend to regress. Most cases of cavernomas are considered congenital, that is present from birth; however, cavernous malformations can develop over the course of a lifetime.〔Cavernous Malformation. 2014. http://www.webmd.com/brain/cavernous-malformation.〕 While there is no definitive cause, research shows that genetic mutations result in the onset of this malformation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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