CTICasesConstrictive Bronchiolitis
Imaging findings
CT chest shows mild bronchial wall thickening. High-resolution expiratory scans demonstrate geographic air trapping, but the patient's expiratory effort was initially poor, requiring repeat scans with proper instruction to confirm the diagnostic air trapping.
Key takeaways
Expiratory CT is highly dependent on patient effort. A poor expiratory effort can fail to show air trapping, leading to a false-negative diagnosis of constrictive bronchiolitis. Radiologists must evaluate the degree of tracheal collapse or diaphragmatic excursion to verify adequate expiration.
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