以肺外表现为首发症状的肺癌，因其首发症状掩盖了原发病，致使误诊，延误了治疗时机。１９９３年４月～１９９５年８月我们遇到５例，报告如下。１　临床资料例１：以腰腿病为首发症状。患者，男，２８岁。主诉腰腿痛伴双下肢无力半年。曾在多家医院拍腰椎片、骨盆片、膝关节 Lung cancer with extrapulmonary manifestations as the first symptom conceals the primary disease because of its first symptoms, which leads to misdiagnosis and delays the timing of treatment. From April 1993 to August 1995, we encountered five cases. The report is as follows. 1 Clinical data Example 1: Lumbar and leg disease as the first symptom. Patient, male, 28 years old. He complained of low back pain and weakness in both lower limbs for six months. Photographed lumbar, pelvic, and knee joints in multiple hospitals