Video 1

Apical four-chamber view, demonstrating incomplete leaflet coaptation between the anterior mitral valve leaflet (AMVL) and posterior mitral valve leaflet (PMVL). L, lateral wall; LA, left atrium; LV, left ventricle; S, septum. View Video 1 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-19-0007/video-1.