眼睑、眼外肌无力和易疲劳是重症肌无力(MG)最常见的临床表现之一,而某些颅内占位性病变则出现貌似 MG 的眼肌麻痹,用新斯的明试验亦呈阳性反应。由此导致误诊者并不少见。我们遇到3例,现报告如下。例1:女,55岁。两侧眼睑下垂伴间歇性右眼水平性复视3个月,晨轻晚重,无其它不适。查体:右睑下垂重于左侧。右眼上视、下视、内收 Eyelid, extraocular muscle weakness and fatigue is one of the most common clinical manifestations of myasthenia gravis (MG), while some of the intracranial space-occupying lesions appear ophthalmoplegia that looks like MG, neostigmine test also showed Positive reaction. As a result, misdiagnosis is not uncommon. We encountered three cases, the report is as follows. Example 1: Female, 55 years old. Both sides of the eyelid ptosis with intermittent right eye horizontal diplopia 3 months, light and heavy morning, no other discomfort. Physical examination: right eyelid ptosis heavier than the left. Right eye, depending on the next adduction