| Namespace | MPheno.ontology | Obsolete | false |
| description | defects in the thin membranous structure between the right atrium and left ventricle that arise from faulty development of the embryonic endocardial cushions; the spectrum ranges from a primum atrial septal defect and cleft mitral valve, known as a partial atrioventricular septal defect (partial AVSD), to defects of both the primum atrial septum and inlet ventricular septum and the presence of a common atrioventricular valve, referred to as complete atrioventricular septal defect (complete AVSD) |
