Aberrant Right subclavian Artery in Association with Common Trunk of Both Carotid Arteries: Diagnosis with CT
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Abstract
The aberrant right subclavian artery (ARSA) is an anatomical abnormality encountered by anatomists and pathologists and more recently radiologists, interventional cardiologists and thoracic surgeons. The incidence of ARSA is 0.2-2% in the population. Cases of an ARSA in retro-tracheal and retro-oesophageal courses in association with common trunk of both carotid arteries have been rarely reported in literature. We reported the case of a retro tracheal RSCA, which originated distally along the left aortic arch and coursed behind the trachea and the oesophagus, diagnosed on computerized tomography angiography (CTA). This was associated with a rare variant of the aortic arch; in which the arch had a common trunk as first branch, which subsequently bifurcated to give the right and left common carotid arteries without any aneurysmal dilatation.
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