J Korean Bal Soc.
2005 Jun;4(1):49-52.
Jerky Seesaw Nystagmus in Isolated Internuclear Ophthalmoplegia
- Affiliations
-
- 1Department of Neurology, Korea University School of Medicine, Seoul, Korea.
- 2Department of Neurology, Seoul National University College of Medicine, Seongnam, Korea. jisookim@snu.ac.kr
Abstract
- 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.