CTICasesExpiratory Collapse of Cysts in Rheumatoid Arthritis
Imaging findings
Inspiratory CT chest shows large, thin-walled subpleural cystic spaces in the lower lobes in a patient with rheumatoid arthritis. Expiratory CT shows near-complete collapse and volume reduction of these cystic spaces, indicating high compliance and communication with airways.
Key takeaways
Rheumatoid arthritis-associated lung disease can cause parenchymal cysts. On expiratory imaging, these spaces can exhibit complete collapse due to high tissue compliance. This dynamic behavior differentiates them from typical fixed emphysematous bullae or fibrotic honeycombing.
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