CTICasesAnomalous Retrovascular Left Upper Lobe Bronchus
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Imaging findings
Chest CT shows the left major fissure positioned unusually early and in an abnormal location. High-resolution imaging and sagittal reconstruction reveal an anomalous retrovascular airway arising directly from the left main bronchus. This aberrant bronchus courses posterior to the fissure to supply the apicoposterior and anterior segments of the left upper lobe, while the main lobar airway bifurcates into lingular and lower lobe branches.
Key takeaways
Anomalous retrovascular left upper lobe bronchus is a rare bronchial branching variation where the upper lobe segments are supplied by an airway originating directly from the left main bronchus. Identifying this anatomical variant is crucial for pre-procedural planning prior to bronchoscopy or lung resection to avoid accidental airway injury.
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