These paired short axis images show a large membranous ventricular septal defect (VSD) (arrow) beneath the septal leaflet of the tricuspid valve. The jet of systolic left-to-right flow across the defect is well demonstrated by Doppler color flow mapping in the left hand panel.
LA: left atrium; RA: right atrium; RV: right ventricle; LVOT: left ventricular outflow tract; PA: pulmonary artery; arrow: VSD.