CTICasesTracheal Dilatation Secondary to Pulmonary Fibrosis
Imaging findings
Chest CT shows severe peripheral, basilar-predominant honeycombing (UIP/IPF) associated with secondary, uniform dilation of the trachea (transverse diameter >3 cm) without the characteristic floppy/lemon-shaped morphology of congenital tracheobronchomegaly.
Key takeaways
Tracheal dilatation (pseudo-tracheobronchomegaly) can occur secondary to severe fibrotic lung disease (e.g., IPF or sarcoidosis) due to increased intrathoracic retractile forces, but lacks the typical cartilage abnormalities of Mounier-Kuhn syndrome.
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