Arteria Lusoria

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Incidental finding on CT Angiography showing aberrant right subclavian artery that exits aorta dorsally to esophagus (arrow). In this case no significant compression on esophagus or trachea is seen. Aberrant Right Subclavian Artery is also known as Arteria Lusoria. Sometimes it can run between trachea and esophagus.
Also note interesting anatomical configuration in the upper mediastinum showing:
RCCA - Right Common Carotid Artery
T - Trachea
LCCA - Left Common Carotid Artery
LSA - Left Subclavian Artery
E - Esophagus
AL - Arteria Lusoria

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