Definition: A muscular ventricular septal defect located in the central muscular septum.

Common Synonyms: Mid-muscular ventricular septal defect.

This four chamber view demonstrates a muscular ventricular septal defect (VSD) at mid interventricular septum (IVS). The borders of the defect are entirely muscular. (TV-tricuspid valve, RV-right ventricle, MV-mitral valve, LV-left ventricle)

Contributor: Diane Spicer, BS

Image Name: ACHS97-3943bcopy.jpg

Left ventricular (LV) view of a mid septal muscular ventricular septal defect (VSD). This defect would not be amendable to device closure with the trabeculations traversing the opening. (MV-mitral valve, AV-aortic valve, PA-pulmonary artery)

Contributor: Diane Spicer, BS

Image Name: UF65-63bcopy.jpg

This view of the right ventricular (RV) septum shows a mid septal ventricular septal defect (VSD). The borders are entirely muscular. There are prominent septoparietal trabeculations (SPT) that mimic ventricular septal defect, with no interventricular communication (OF-oval fossa, TV-tricuspid valve, PV-pulmonary valve)

Contributor: Diane Spicer, BS

Image Name: UF65-63acopy.jpg

The four chamber view of this heart demonstrates a mid septal, restrictive, muscular septal defect (VSD).  The interatrial septum is intact and there is biventricular hypertrophy.  (SCV-superior caval vein, RA-right atrium, LA-left atrium, RV-right ventricle, LV-left ventricle)

Contributor: Diane Spicer, BS

Image Name: MVSDrestr.jpg

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