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A 52 year old man developed right lower leg weakness. Four days later, he presented to the ER.
(Left) Axial CT; (Right) Axial Flair MRI scan. Note the lesion in the left medial frontal lobe in the left 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.
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