Hibernoma as an incidental finding in the 18F-FDG PET/CT of a patient with melanoma.

Despite being benign tumors, hibernomas show intense fluorine-18-fluorodeoxyglucose uptake, as they are derived from brown fat, which is frequently seen as hypermetabolic fatty areas on PET/CT. We present the case of a patient with cutaneous melanoma, diagnosed with a cervical hibernoma mimicking a metastatic lymph node at fluorine-18-fluorodeoxyglucose PET/CT. Being aware of the metabolic behavior and radiologic appearance of this entity may prevent reporting false-positive lesions, especially in an oncologic setting.