To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 1 Apical four-chamber, pre-operatively. View Video 1 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-20-0016/video-1. Cor triatriatrum or divided left atrium presenting as mitral stenosis in an adult patient Alfonso Pecoraro, Jacques Janson, and Jacob Daniel Cilliers 2020. 7:I11-I13 DOI: 10.1530/ERP-20-0016 Download Original Video