Membranous VSD with double chambered RV still frame

Paired subcostal parasagittal images with and without superimposed color flow mapping, demonstrating narrowing of the right ventricular outflow tract (RVOT) by muscle bundles (thick arrows), positioned cephalad to the ventricular septal defect (VSD) (thin arrow), dividing the right ventricle into a caudal high pressure chamber and a more cephalad low pressure chamber.