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J Korean Neurol Assoc. 2005 Dec;23(6):827-829. Korean. Case Report.
Oh YM , Choi KD , Oh SY , Park SH , Kim JS .
Department of Neurology, Seoul National University College of Medicine, Seoul, Korea. jisookim@snu.ac.kr
Department of Neurology, Dong-a University College of Medicine, Busan, Korea.
Abstract

Periodic alternating nystagmus (PAN) is characterized by a periodical reversal in the direction of the nystagmus. PAN has rarely been reported in discrete cerebellar lesions. We report a patient with PAN from a focal cerebellar lesion, which developed after removal of an ependymoma in the fourth ventricle. The nystagmus decreased upon tilting the head in the direction of the nystagmus. The positional modulation of the nystagmus supports that PAN occurs from an abnormal velocity storage mechanism.

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