临床上，肺癌发生脑转移者并不少见，其中半数由于精神、神经症状先于肺癌表现，故易误诊为脑血管意外或脑肿瘤。近年来，我们遇到３例误诊患者，现报告如下。例１：女，６４岁。因头晕、乏力、失眠２０天，突发剧烈头痛伴左侧肢体无力２天入院。既往有动脉硬化史。查体：... Clinically, brain metastases from lung cancer are not uncommon, and half of them are misdiagnosed as cerebrovascular accidents or brain tumors due to mental and neurological symptoms preceding lung cancer. In recent years, we have encountered three cases of misdiagnosis. The report is as follows. Example 1: Female, 64 years old. Due to dizziness, fatigue, and insomnia for 20 days, a sudden severe headache with left limb weakness was admitted to the hospital for 2 days. Past history of arteriosclerosis. Examination:...