Axial CT scan (level of the basal ganglia). The scan appears normal. However, looking closely, a collection of dark vascular spaces are seen in the region of the left Sylvian fissure. Without contrast or an angiogram, AVMs may be easily missed. Arteriovenous malformations (AVMs) are a congenital abnormality of blood vessels. They consist of a tangle of abnormal vessels supplied by arterial feeders and often drained by large dilated veins. AVMs usually present either with headaches, seizures or bleeding. Larger AVMs are often seen on CT or MRI. Angiography is required to define the vascular anatomy and plan appropriate treatment. Treatment may involve surgical resection, embolization or radiotherapy.
Revised
04/23/06.
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