核间性眼肌麻痹(INO)以侧视时眼球运动障碍伴分离性眼球震颤,而辐辏运动往往正常为特征,可单侧或双侧出现。通常认为本症是由于损害了内侧纵束所致,提示为髓内病变,故有作者以此作为脑干髓内外病变之鉴别依据,国内近年报道的121例也均系髓内病变所致。本文2例为髓外病变所致TNO。 Intercostal ophthalmoplegia (INO) with lateral eye movement disorder associated with isolated nystagmus, while the convergence of the motor tend to be characterized by normal, can be unilateral or bilateral. It is generally believed that this disease is due to damage caused by the medial longitudinal bundle, suggesting intramedullary lesions, so the author as a basis for identification of lesions of the brain stem and internal and external, 121 cases reported in recent years are also caused by intramedullary lesions. 2 cases of extramedullary disease caused by TNO.