Near Sudden Death From Cardiac Lipoma in an Adolescent

Abstract

A previously healthy 13-year-old boy collapsed at home. The emergency medical service diagnosed ventricular tachycardia and cardioverted to sinus rhythm. The left cardiac contour was abnormal on radiography (Figure 1). Echocardiography showed a large mass at the lateral mitral annulus (Figure 2), without impediment to valvar function or blood flow. Magnetic resonance imaging (MRI) confirmed an encapsulated, homogenous, 5×4×5-cm mass, embedded in the myocardium, adjacent to but not involving the circumflex coronary artery. This mass had hyperintense MRI T1-weighted …