It is well known that radiological study is the most important and mandatory procedure to establish thepresence of bronchiectasis and to determine precise extent. In every individual case. The diagnosis is establishedby, and the indication for surgery is based on, the detailed radiological findings. During four years from Sep.1972 to Sep. 1976 clinical and radiologic findings of 100 cases of proven bronchiectasis with no acid fastbacillus in sputum at Seoul National University Hospital are analysed. The diagnosis was based on bronchography inall cases. The results are as follows; 1. The relation of male to female was 6:4 and peak incidence was in thirddecade. 2. Chronic cough, purulent sputum and hemoptysis were main symptoms. 3. Moist rales and wheezing hearedover the affected area of the lung, were main clinical sings but no physical finding was found in 41% of cases. 4.Simple chest P-A films revealed various findings indicating bronchiectasis and were highly suggestive ofbronchiectasis in the great majority of cases but were normal in 8% of cases. 5. The extent of the disease wasusually confined to one or two lobes and the left lung was much more often involved than the right. Bilateralinvolvment was approximately 30% incidence. The involvemenet was the left lower lobe, the lingular segment of theleft upper lobe, and the right lower olbe in order of frequency.