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  • Title: [A case presenting vertical one-and-a-half syndrome and seesaw nystagmus due to thalamomesencephalic infarction].
    Author: Sekine S, Utsumi H, Kaku H, Otsuka T, Harukawa H, Horiguchi S.
    Journal: No To Shinkei; 2003 Aug; 55(8):699-703. PubMed ID: 13677304.
    Abstract:
    A 58-year-old woman presented, conjugate upgaze palsy and monocular paresis of downward gaze in the ipsilateral eye (vertical one-and-a-half syndrome; VOHS) as well as seesaw nystagmus (SSN). Vertical oculocephalic response and conjugate horizontal gaze were preserved. Magnetic resonance imaging revealed a right thalamo-mesencephalic infarction including the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF) and the interstitial nucleus of Cajal. On the 22nd hospital day SSN was disappeared, and then on the 32nd day VOHS was improved. The lesions of VOHS may have affected the efferent tracts of riMLF and the descending fibres to the ipsilateral subnucleus of the inferior rectus and contralateral subnucleus of the superior oblique. Furthermore, it was assumed that SSN was caused simultaneously by a lesion in the interstitial nucleus of Cajal existing in the adjacent area of riMLF.
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