Ventricular septal defect Inlet ventricular septal defect 2012-04-08T09:38:29Z Atrioventricular canal type ventricular septal defect A ventricular septal defect that involves the inlet of the right ventricular septum immediately inferior to the AV valve apparatus. HP:0011622 The muscular septum is a nonplanar structure that can be divided into inlet, trabecular, and infundibular components. The inlet portion is inferioposterior to the membranous septum. It begins at the level of the atrioventricular valves and ends at their chordal attachments apically. Fyler:1340 Type 3 ventricular septal defect