周期性方向交代性眼振を呈した傍腫瘍症候群の1例

Abstract

Periodic alternating nystagmus (PAN) is defined as abnormal horizontal eye movements in periodically alternating directions, and the condition could be both congenital and acquired. Acquired PAN refers to a spontaneous horizontal nystagmus, present in central gaze, reversing in direction periodically. Acquired PAN has been reported to occur in association with a number of conditions, many of which involve the cerebellum.