A vascular malformation usually called avm(arterial venous malformation) is usually do to a congenital or traumatic abnormal connection between an artery and a vein. It can also involve lymphatic channels. Pain is caused by nerve irritation as it enlargers or due to asymmetry that occurs as it grows. There are many treatments for avm's including sclerotherapy, embolization and surgery.
Answered Dec 10, 2013
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