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Positron emission tomography using 18-fluorodeoxyglucose (FDG-PET) was used to image the metabolic activity in the aorta (solid arrow) and head and neck vessels (open arrow) both before (left hand panels) and after (right hand panels) treatment with pulsed cyclophosphamide and prednisolone. Uptake in the heart and thyroid glands is similar but the aortic uptake has been dramatically reduced by treatment.
