CTICasesTracheal Bronchus with Hypoplastic Accessory Lobe
Imaging findings
Incidentally on a trauma CT, there is a tracheal bronchus arising as a diverticulum-like airway that ends in a small hypoplastic accessory lobe (resembling a small azygos-type recess) at the right apex, with tiny airways supplying it.
Key takeaways
A tracheal bronchus can supply a small hypoplastic accessory lobe, an uncommon airway variant. Because the lobe has its own airway supply from a right upper lobe/tracheal bronchus, it does not fit the conventional definition of a true azygos lobe, making it an interesting anatomic variant to recognize.
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