Osteitis Fibrosa Cystica Caused by Hyperparathyroidism Shown on 18F-NaF PET/CT.

F-NaF PET/CT in hyperparathyroidism and osteitis fibrosa cystica is rarely reported. We report the case of a 16-year-old boy who underwent NaF PET/CT for the evaluation of bilateral bone destruction, which was incidentally noted on an abdominal x-ray. The PET/CT images identified multiple bony abnormalities in the skull, pelvis, and limbs. In addition, a hypodense nodule was found posterior to the inferior pole of the right lobe of thyroid gland. Subsequent Tc-sestamibi imaging showed abnormal uptake in the neck nodule, which was confirmed as parathyroid adenoma by the pathology.