Cardiac sarcoidosis mimicking arrhythmogenic right ventricular dysplasia in a patient presenting with monomorphic ventricular tachycardia

Introduction Ventricular arrhythmia (VA) is most commonly caused by ischemic heart disease. However, alternative etiologies of VA, including channelopathies, congenital heart disease, other cardiomyopathies such as hypertrophic cardiomyopathy, drugs, electrolyte imbalances, and infiltrative diseases must always be considered on the differential. Arrhythmogenic right ventricular dysplasia (ARVD) and cardiac sarcoidosis (CS) are uncommon causes of VA and increase the risk for sudden cardiac death. Both diagnoses are far distinct from each other, but they can be confused if a diagnosis is made and alternative diagnoses are not thoroughly considered. We present the case of a 66-yearold man who presented to our hospital in monomorphic ventricular tachycardia (VT) owing to CS mistaken as ARVD.