Figure 4  .

(A) The diagonal artery (arrowheads) passes across the subpulmonary infundibulum. It has been traumatised by sutures securing the outflow patch, resulting in infarction and thinning of the left ventricular wall. The anterior interventricular artery was absent. (B) The aberrant origin of the diagonal branch was not visualised on the atypical laid back view (case 15). Review of the straight lateral view shows the course of the aberrant artery (arrowheads). Ao, aorta; DB, diagonal branch; IB, infundibular branch; PT, pulmonary trunk; RCA, right coronary artery.