CTICasesExpiratory Collapse of Lower Lobe Cystic Airspaces
Imaging findings
Inspiratory and expiratory CT chest scans show large, conglomerate subpleural cystic airspaces in the lower lobes, associated with mild surrounding reticulation and emphysema. On expiration, these cystic airspaces show near-complete collapse, demonstrating free communication with the bronchial tree.
Key takeaways
Large subpleural cystic spaces in the lower lobes (often associated with smoking, emphysema, or connective tissue disease-associated fibrosis) can be dynamic, collapsing completely on expiration. This indicates patent airway communication and distinguishes them from non-communicating bullae.
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