PSLAX view demonstrating a rheumatic mitral valve with suggestive RHD-related restriction of the AMVL and PMVL. The A2 segment of the AMVL is seen to ‘prolapse’ past the P2 segment of the PMVL. This mechanism is more correctly termed ‘pseudoprolapse’ as the AMVL is in its normal position at end systole. The impression of A2 prolapse is rather thought to be related to PMVL systolic restriction with resultant malcoaptation of the PMVL and AMVL during systole. This generates the characteristic posteriorly directed jet of rheumatic MR. View Video 10 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-18-0010/video-10.