周期性动眼神经麻痹，是一种较为罕见的疾病，国内文献迄今仅有８例报道［１，２］，现将我们诊治一例报告如下：患者任××，男性，５岁。主诉从床上坠地后出现左眼上睑下垂、睑裂及瞳孔时大时小３年。患儿为第一胎，足月顺产。发育史及家族史无特殊。体格检查：全身未见异常 Cyclical oculomotor palsy, is a relatively rare disease, the domestic literature so far only 8 cases reported [1,2], now a case of diagnosis and treatment as follows: You Ren × ×, male, 5 years old. Appear from the bed fell to the ground after the left eye ptosis, palpebral fissure and pupil when large small 3 years. Children for the first child, full-term birth. Developmental history and family history no special. Physical examination: No abnormalities in the whole body