肺癌是常见的癌肿之一,近年来许多报告表明,其发生率有逐渐增高的趋向。X线检查对肺癌的诊断占相当重要的位置,且检查方法不复杂,病人易于配合,往往能得出较明确的诊断。但由于早期肺癌的症状不多。许多病例来就诊时已属晚期;或来时是 Lung cancer is one of the common cancers. In recent years, many reports have shown that the incidence has gradually increased. X-ray examination of the diagnosis of lung cancer occupies a very important position, and the examination method is not complicated, the patient is easy to cooperate, often can give a more definite diagnosis. However, due to the early stage of lung cancer, there are few symptoms. Many cases have been advanced at the time of treatment;