Cerebral arteriovenous malformation
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MRI images show a nidus of compact vessel with the typical appearance of "bag of black worms" in the left frontoparietal region.
The feeding artery appears to come from the pericallosal branch of left anterior cerebral artery, and the draining vein drains into internal cerebral vein.
Note the typical wedge shape of the lesion with the base lying on cortex and apex pointing to the ventricle.
Typical appearance of cerebral AVM.