Accessory mitral valve tissue in both obstructive and nonobstructive hypertrophic cardiomyopathy cases

Accessory mitral valve tissue (AMVT) is a rare congenital cardiac anomaly that is often associated with other congenital heart defects. Although it is typically diagnosed in earlier, its presence in adulthood is extremely rare, particularly in patients with hypertrophic cardiomyopathy (HCM). The coexistence of these two conditions can make diagnosis challenging, particularly in patients with left ventricular outflow tract (LVOT) gradient formation. In these case series, we highlight the importance of multimodality imaging, in accurately identifying AMVT, differentiating it from other conditions and identifying the different morphologies of AMVT.