Retired spray painter, smoked. Known old Tuberculosis infection. Otherwise, the lungs are large volume. There are numerous enlarged air-spaces throughout the lungs. These are more confluent in the upper zones.
Lobular emphysema is present, giving sub-pleural blebs and bullae.
There are cyst-like areas in the abnormal lungs with thin walls, below 1mm and are unrelated to the bronchi, so are not traction or cystic bronchiectasis. There is lung of more normal density at the lung bases. The vessels are more numerous in this region and the visible patchy ground glass shadowing without loss of silhouette of the basal vessels is a reflection of the increased perfusion in what little remains of the more normal lung. This used to be called the 'marker vessel area' in the plain film assessment. Because the abnormal lungs lack normal elasticity, the airways collapse quickly on expiration and result in air trapping.