周围型小肺癌是指病灶直径≤2cm的恶性结节。由于大部分患者无明显自觉症状或体征,须通过健康普查的方法来发现。而普通胸透或胸片对较小的肺癌结节或在隐蔽部位的小结节较难发现,有些即使发现了也因对小结节的细节显示较差,给诊断带来困难。近年来,随着CT机的广泛应用,尤其是螺旋CT(SCT)扫描与高分辨率CT Peripheral small lung cancer refers to malignant nodules of lesion diameter ≤ 2cm. Because most patients have no obvious symptoms or signs, to be found by the method of health census. The general thoracic or chest radiographs of smaller lung nodules or nodules in the hidden parts more difficult to find, and some even found that due to the details of small nodules showed poor, to the diagnosis of difficulties. In recent years, with the widespread use of CT machines, especially spiral CT (SCT) scan and high-resolution CT