Twenty-five patients with pulmonary malignancies were evaluated by computerized tomography (CT) and plain films. The results fully showed the importance of scanning in CT exmination which was a lot superior to plain films in identifying the border, and the density of the lesions, the adenopathy in the pulmonary hilum and mediastinum, the extent of invasion into the mediastinal structures and the chest wall. Lobulated or spiculated solitary nodules with a CT value of <100 Hu were confirmative evidence of the peripheral type of pulmonary cancer. In the case of the central type of pulmonary cancer, CT scanning could visualize both the endobronchial and extrabronchial parts of the lesion simultaneously. In addition, the findings of small-cell bronchogenic carcinoma were reviewed as well.