Fig. 7
From: Diffuse smoking-related lung diseases: insights from a radiologic-pathologic correlation
Subtypes of PSE according to the Fleischner Society guidelines on HRCT. a Axial CT shows mild PSE (white arrows) with up to 1 cm juxtapleural well-demarcated lucencies. b Axial CT depicts substantial PSE, defined as cyst-like lucencies or bullae greater than 1 cm adjacent to the pleura. The patient had spontaneous pneumothorax and black arrow depicts a chest drain. Subcutaneous emphysema is also visible in the right thoracic wall