Background: Ventricular arrhythmia may be an isolated benign finding in children, a marker of serious systemic disease or myopathy or a mechanism for syncope and sudden cardiac death. Arrhythmogenic right ventricular dysplasia (ARVD) is an inherited cardiomyopathy disorder, leading to arrhythmias, and predominantly involving the right ventricular myocardium. Aim of the work: Evaluation of pediatric patients with ventricular arrhythmias for presence of systemic disease and detection of cardiac abnormalities that could not be detected by routine echocardiography using cardiac magnetic resonance imaging (CMR) in children with a structurally normal heart.