[Table/Fig-17b]:

A three -month-old male with breathing difficulty, recurrent chest infection, diagnosed with truncus arteriosus; (a) Axial CT view shows configuration of aortic arch (arrow) and origin of pulmonary artery(arrow); (b) 3 D reconstruction showing larger aorta (arrow) and RPA and LPA arising posteriorly (open arrows). Also, there is an aberrant left subclavian artery (triangle).