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1 Parinaud's syndrome with impaired upward saccades and otherwise normal vertical eye movementsThis is a 50-yo-man who suffered a dorsal midbrain stroke. Exam demonstrated normal vertical range of eye movements, normal vertical VOR and smooth pursuit, but inability to perform upward saccades. Another feature of Parinaud's syndrome seen on his exam was light-near dissociation (not shown in thi...abnormal saccades, range of eye movements, abnormal range of eye movements, smooth pursuit, normal VOR, Dorsal midbrain syndrome
2 Smooth PursuitA pursuit deficit in one direction suggests an ipsilesional localization, but beware of a superimposed spontaneous nystagmus; a pursuit deficit in all directions is commonly seen with cerebellar lesionsPursuit, Exam
3 riMLF Syndrome from Artery of Percheron StrokeThis is a 65-yo-man who suffered the abrupt onset of loss of consciousness followed by difficulty looking down. MRI showed bilateral rostral midbrain strokes in the distribution of the artery of Percheron. He could not initiate downward saccades and had fair upward saccades. However, downward vestib...Saccades abnormal; Vestibulo-ocular reflex and head impulse testing normal; Pursuit normal; Vertical gaze palsy; Downgaze palsy; Mesencephalon
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