CTICasesPneumothorax with Pleural Webs vs. Giant Bullous Emphysema
Imaging findings
High-resolution CT demonstrates a comparison between a pneumothorax with pleural webs and giant bullous emphysema. The pneumothorax is characterized by a distinct, thin, continuous pleural line separating the lung parenchyma from the pleural air space containing thin fibrous webs. In contrast, the giant bullae lack a sharp, continuous bounding outer pleural line, and their borders exhibit a more concave contour pulled by the elastic recoil of the surrounding lung.
Key takeaways
Distinguishing giant bullae from a pneumothorax is critical to prevent accidental chest tube placement into a bulla. A reliable CT differentiator is the presence of a continuous, well-defined pleural line in pneumothorax, which is absent in giant bullae. Additionally, the border of a bulla is often concave relative to the lung parenchyma due to regional elastic recoil, whereas a pneumothorax contour is typically flat or convex.
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