As part of the April issue's focus on secondary (functional) mitral regurgitation (MR), JACC: Cardiovascular Imaging has published video case studies highlighting commonly encountered situations in the assessment of MR. Developed by Paul A. Grayburn, MD, FACC, and James D. Thomas, MD, FACC, the seven videos contain cases illustrating assessment of the mechanism of MR, situations for which MR is often difficult to quantitate, and the concept of disproportionate and proportionate secondary MR. For more on this topic, read the authors' state-of-the-art review, Basic Principles of the Echocardiographic Evaluation of Mitral Regurgitation. Read the full issue and sign up for journal email alerts.