A ventricular septal defect (VSD) occurs when there is direct ... Membranous VSDs are the most common type and originate inferior to the crista supraventricularis, yet still towards the left ...
Perimembranous VSDs are also inferior to the crista supraventricularis ... causing the aortic valve leaflet to prolapse into the VSD resulting in significant aortic valve regurgitation.
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