Perimembranous ventricular septal defect: the membranous septum is very small, therefore, ventricular septal defects usually extend into the surrounding muscle septum, and this is called perimembranous ventricular septal defect; this type of ventricular septal defect is the most common after infancy, accounting for 75% of all ventricular septal defects; defect surrounding the membranous septum, at the meeting point of the three right ventricular components (inlet, apical trabecular and outlet); the diagnostic feature is fibrous continuity between the leaflets of the aortic and tricuspid valves; can extend to open mostly to the inlet or outlet of the right ventricle, or can be confluent, juxta-crux ventricular septal defect: particular posterior perimembranous defect associated with straddling and overriding of the tricuspid valve; diagnostic feature is malalignment between the atrial and ventricular septum.


Down Syndrome Ventricular Septal Defect Patch Closure Semilunar Valve Atrioventricular Septal Defect 
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