Double aortic arch: an orifice projection using angled cineangiography.

Double aortic arches are usually shown angiographically by an injection of contrast in the aortic root with filming in the frontal (PA) and lateral projections. This is not completely satisfactory, however, as superimposition may mask the site of an associated atresia, which dictates the point at which the narrower arch should be divided. An angled view of the orifice of the ring, obtained in a six-week-old boy, showed the complete anatomy of the malformation.