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  • Title: [A case of left third nerve palsy and contralateral vertical gaze palsy with medial midbrain infarction].
    Author: Adachi T, Takagi Y.
    Journal: Rinsho Shinkeigaku; 2000 Aug; 40(8):807-10. PubMed ID: 11218701.
    Abstract:
    An 81-year-old man developed oculomotor nerve palsy of the left eye and vertical gaze palsy of the right eye due to left medial midbrain infarction. His left eyelid was ptotic and the pupil was dilated. His right eye showed normal horizontal movement and Bell's phenomenon was preserved although the oculocephalic reflex was incomplete. There were no other abnormal neurological findings. The brain MRI revealed a high-intensity lesion in left medial midbrain on T2 weighted image. This lesion involved the oculomotor nerve nucleus, the interstitial nucleus of Cajal, and the rostral intersititial nucleus of the medial longitudinal fasciculus (riMLF). We thought that upward gaze palsy of the right eye was resulted from the infarction of the left riMLF or disruption of the axonal collateral of upward gaze fibers in the left oculomotor nucleus. Downward gaze palsy was resulted from the damage of the downward gaze fibers before their decussation, or the damage of the left interstitial nucleus of Cajal. This case provides evidence that unilateral lesion of the midbrain could cause contralateral vertical gaze palsy.
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