From the case:
Cardiac bronchus
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Coronal reconstruction of a chest CT demonstrates a small blind ending stump extending inferiorly and medially from the bronchus intermedius. There is no associated mass or consolidation.
Findings are those of an incidental cardiac bronchus.
Case Discussion
A cardiac bronchus is a rare variant, found in only ~0.3% of individuals. It arises from the bronchus intermedius just after the bifurcation of the right upper lobe bronchus and in about half of cases it aerates lung parenchyma.