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A 42 year old man developed left lower leg weakness one week after successful coiling of an anterior communicating artery aneurysm which had bled.
Axial CT scans. Note the hypodense area in the right medial frontal lobe in the right anterior cerebral artery distribution. As the lesion is more than 2-3 days old, it is seen as a hypodensity on CT. As the anterior cerebral artery supplies the medial frontal lobe, the contralateral leg is predominantly affected. In this case, vasospasm following the subarachnoid hemorrhage was the cause.
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