label: Muscular ventricular septal defect
label_lc: muscular ventricular septal defect
description: "The trabecular septum is the largest part of the interventricular septum. It extends from the membranous septum to the apex and superiorly to the infundibular septum. A defect in the trabecular septum is called muscular VSD if the defect is completely rimmed by muscle."