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A 78 year old woman developed the abrupt onset of a right third nerve palsy and a left hemiparesis. Sensation was intact.
(Left) MRI Flair image; (Right) Diffusion-weighted image. Note the high signal on the diffusion image in the ventral midbrain and cerebral peduncle. Infarction in the midbrain results in a classic "crossed" neurology syndrome of an ipsilateral 3rd nerve palsy and a contralateral hemiparesis.
The Electronic Curriculum is copyrighted 1998, Case Western Reserve University School of Medicine.