Abstract
1. Distinguishing bronchial deformity or dilatation occurs in bronchiectasis, as well as in acute and chronic bronchitis.
2. Bronchiectasis consists of a permanent saccular or fusiform bronchial deformity following a previous pneumonia in the same area.
3. Acute bronchitis has a reversible cylindrical deformity of the dependent bronchial following an acute respiratory infection.
4. Chronic bronchitis has diffuse bronchographic features. Preliminary clinical studies suggest that these features may be due to elevated intrabronchial pressure produced by an obstructing mechanism during cough.