Abstract
Isolated foot drop due to a brain lesion is rare. A 48-year-old man complained of inability to dorsiflex the right foot. Right dorsiflexion had 0/5 muscle strength and there were no upper neuron findings on his neurological examination. Magnetic resonance imaging of the brain revealed a left parasagittal brain mass. The lesion was removed and muscle activity returned with 3/5 muscle strength 6 weeks after the operation. The parasagittal area is located at the foot of the homunculus. Therefore, in patients with foot drop, lesions of the parasagittal area should be considered.
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