CTICasesAberrant Bronchial Artery from Left Subclavian Artery and Left Atrial Diverticulum
Imaging findings
CT angiogram shows a rare vascular variant where a bronchial artery arises directly from the origin of the left subclavian artery and courses paratracheally under the carina to the right hilum. Additionally, a smooth-walled left atrial diverticulum is identified arising from the posterior/atypical wall of the left atrium.
Key takeaways
An anomalous origin of the bronchial artery (e.g., from the left subclavian) is a rare vascular variant that can mimic a mediastinal branch. Left atrial diverticula are benign outpouches that must be distinguished from accessory atrial appendages by their smooth margins and lack of pectinate muscles.
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