A spectrum of congenital, inherited, or acquired abnormalities in blood vessels that can adversely affect the normal blood flow in arteries or veins. Most are congenital defects such as abnormal communications between blood vessels (fistula), shunting of arterial blood directly into veins bypassing the capillaries (arteriovenous malformations), formation of large dilated blood blood-filled vessels (cavernous angioma), and swollen capillaries (capillary telangiectases). In rare cases, vascular malformations can result from trauma or diseases.

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