“…Several right ventricular septal landmarks were used to define the location of the septal defects: tricuspid annulus at septal leaflet attachment, posterior margin of the ventricular septum, apex of the right ventricular sinus, septal band, apex of the right ventricular infundibulum, anterior margin of the ventricular septum, outflow septum, and membranous septum ( Figure 9). 44 In addition, the perimembranous VSD has been classified in different categories to properly select the closure device. In a series of 412 patients with perimembranous VSD, the defect was classified according to the shape of the defect on ventriculography: infundibular, aneurysmal, tubular, and window-like ( Figure 9).…”