Keywords: 18F-FDG, fluorine-18-fluorodeoxyglucose; CMR, cardiovascular magnetic resonance imaging; Cardiac sarcoidosis; Computed tomography (CT); ECG, electrocardiogram; Fluorine-18-fluorodeoxyglucose (18F-FDG); LV, left ventricular; PET-CT, positron emission tomography–computed tomography; Positron emission tomography (PET); Sinus node dysfunction.