Figure 2: PET/CT scans: baseline imaging and after treatment with beta-blockers. A: Baseline 18F-FDG PET/CT scan shows an extremely high FDG uptake within the mediastinal mass (SUV max 29) suspicious for hypermetabolic malignant lesion. B: PET/CT scan after five days of treatment with propranolol (120 mg/die) demonstrate a complete disappearance of tracer hyperaccumulation within the mass. C: PET/CT scan after six months, under the same treatment protocol, confirmed an absent FDG uptake within the lesion.