Assertion: double aortic arch | /r/HasProperty | diagnosed
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text: A double aortic arch (DAA) was diagnosed when both aortic arches were clearly recognisable arising from ascending aorta, one on either side of the trachea, joining posteriorly to form a single descending aorta.1 ,2 A vascular ring occurs when congenital anomalies of the aortic arch and its related vessels result in encirclement of the trachea and oesophagus with the potential of causing varying degrees of obstruction to either or both.