By studying the standard chest x-ray and computerized tomography spiral in primary lung cancer patients, the study find that: Position of tumors seen in right lung 51.6 percent, in the left lung: 48.4 percent, upper lobe: 53.8 percent, the lower lobe: 38.7 percent. Tumor size of 3 cm up the majority (81.7 percent). Irregular outer: 75.3 percent. Characteristics inside: the tumors