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Unstable atrioventricular block (AVB) and suspected clinically isolated cardiac sarcoidosis (CS). CT, computed tomography; FDG, fluorodeoxyglucose; MRI, magnetic resonance imaging; PET, positron emission tomography. ∗ Consider inserting a screw-in-lead temporary pacemaker and performing an FDG-PET scan to increase diagnostic yield. † Consider performing cardiac magnetic resonance imaging as soon as possible if the device is compatible and FDG-PET scan if not already performed.
