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J Korean Bal Soc. 2005 Jun;4(1):49-52. Korean. Case Report.
Oh K , Chang JH , Park KW , Lee DH , Choi KD , Kim JS .
Department of Neurology, Korea University School of Medicine, Seoul, Korea.
Department of Neurology, Seoul National University College of Medicine, Seongnam, Korea.

The authors report jerky seesaw nystagmus, extorsional downbeating in the right eye and intorsional upbeating in the left eye, in a patient with right internuclear ophthalmoplegia (INO). This pattern of nystagmus may occur by disrupting pathways from contralateral posterior and anterior semicircular canals by a lesion in the medial longitudinal fasciculus. Depending on damage to the pathways from contralateral vertical canals, various patterns of dissociated torsional-vertical nystagmus may accompany INO.

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