Brown adipose fat
Hodgkin disease follow-up.
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Symmetric intense FDG uptake in the neck, supraclavicular fossa, paravertebral, axilla and mediastinum, corresponding to fat areas, is shown. These hypermetabolic areas are compatible with activated brown adipose fat (BAT) and shouldn't be confused with malignancy localizations.
Activated brown adipose fat is a potential pitfall on 18-FDG PET/CT.
The PET/CT study has been performed on January and the patient is relatively young. It is well known that BAT accumulation is inversely proportional to age and its metabolism is extremely stimulated by cold temperature.