A ventricular septal defect that is confluent with and involves the membranous septum and is bordered by an atrioventricular valve, not including the type 3 VSDs. The phenotype is HP_0011682 (Perimembranous ventricular septal defect). Also known as: Conoventricular ventricular septal defect, Membranous ventricular septal defect, Paramembranous ventricular septal defect, Perimembraneous ventricular septal defect, Type 2 ventricular septal defect.