Increased (18)F-FDG activity in fatty tissue has previously been reported with PET/CT. We previously named this activity uptake in supraclavicular area fat ("USA-Fat"). We and others have speculated that this uptake exists in metabolically active brown adipose tissue (BAT). Such tissue might be expected to have varying metabolic activity depending on the ambient temperature. The purpose of this study was to evaluate the frequency of USA-Fat and its relationship to the outdoor temperature.
Division of Nuclear Medicine, Department of Radiology, Johns Hopkins Outpatient Center, Johns Hopkins Medical Institutions, 601 N. Caroline Street, Baltimore, MD 21287-0817, USA.
