The incidece of primary lung cancer is increasing in our country. This presentation is an attemot to correlate a useful diagnosis with radiological findings of primary lung cancer. Histologically proved 210 cases of primary lung cancer during the period of 15 years were reviewed with plain chest films, tomogram, bronchgram and pulmonary angiogram. The results are as follow : 1. Male to Female sex ratio was 4:1. Incidence was most common in 5th decade as 40%. 2. Pathologic cell types of primary lung cancer are as follow: Epidermoid Ca. 65%, Adeno Ca. 18%, Small cell Ca. 9.5%, Large cell Ca. 2%, Unclassified Ca. 3.3%, Mucoepidermoid Ca. 2.4%, Mixed Ca. 0.5%. 3. In smoking history : 91% of epidermoid Ca., 17% of small cell Ca., 30% of adeno Ca. has smoking history. 4. In mass size: Average diameter of mass was most was 5.3cm. Hilar mass was seen in 48 cases. Hilar mass was most frequent finding in small cell Ca. and the peripheral mass in adeno Ca. 5. Cavitary lung Ca. was 26 cases (12.4%) and most cases had relative thick wall and its mean thickness was 3.6mm. 6. Coexistence of pulmonary tuberculosis and lung cancer was 22 cases (10.5%), and most common in epidermoid cell Ca. as 16 cases. 7. Other findings include metastsis to lymphnode, bone and other organ, and pleural effusion.