Comparison of pre- and post-treatment18 F-fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) images in a patient with relapsing polychondritis (RPC). (A) Maximum intensity projection and (B-D) axial FDG-PET/CT findings of RPC in a 74-year-old female patient presenting with nasal symptoms. The patient was positive for type II anti-collagen antibody, and nasal cartilage biopsy was consistent with RPC. FDG accumulation (SUVmax = 13.03) is well defined from the infrahilar region of the left inferior lobe to the pulmonary hilus (A1 and B1, arrow) and conspicuous in the nasal cavity (SUVmax = 9.50) (C1 and D1, arrow). Neither bronchial wall thickening nor bronchial stricture is apparent. Post-treatment images show a complete lack of accumulation (A2-D2). SUV, standardized uptake value.