An Unusual Cardiac Fibroelastoma Case

A 12-year-old boy presented with paroxysmal chest pain for 2 months, and sudden onset of syncope lasted ≈2 minutes. On transthoracic echocardiogram, the parasternal long-axis view showed an echo-dense mass attached to the left ventricular anterolateral papillary muscle, extending to the anterior mitral valve chordae, the left ventricular outflow tract, and the aortic root (Figure 1A and Movie I in the online-only Data Supplement). The apical 5-chamber view demonstrated that the mass in the left ventricular outflow tract extended into the aortic root through the aortic valves (Figure 1B). The apical 4-chamber view illustrated that the mass was on the mitral valvular chordae and papillary muscle (Figure 1C and 1D and Movie II in the online-only Data Supplement). The series of parasternal long-axis views showed that the mass in the aortic root was close to the orifice of the right coronary artery (RCA) and swung into the RCA during the cardiac cycle (Figure 2 and Movie I in the online-only Data Supplement). Left ventricular function was normal, …