The subject will undergo a fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (18F FDG PET/CT) at the Diagnostic Imaging unit of The Hospital for Sick Children.
In the Metabolic Disorder clinic at The Hospital for Sick Children, the investigators identified a male, proband with possible Luft's disease. The investigators hypothesize that Luft's disease is caused by excess or dysregulation of brown/beige fat tissue.~To address the hypothesis, the investigators would like to assess brown fat distribution and activity in this subject.