Interesting ImagesOsteitis Fibrosa Cystica Caused by Hyperparathyroidism Shown on 18F-NaF PET/CTDeng, Yan MD∗; Shen, Xing MD∗; Lei, Lei MD†; Zhang, Wei MD, PhD†Author Information From the ∗Department of Pediatrics, Affiliated Hospital of Southwest Medical University †Department of Nuclear Medicine, Affiliated Hospital of Southwest Medical University/Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, People’s Republic of China. Received for publication March 6, 2020; revision accepted March 27, 2020. Conflicts of interest and sources of funding: none declared. Correspondence to: Wei Zhang, MD, PhD, Department of Nuclear Medicine, the Affiliated Hospital of Southwest Medical University, No. 25 TaiPing St, Jiangyang District, Luzhou, Sichuan, People’s Republic of China 646000. E-mail: firstname.lastname@example.org. Clinical Nuclear Medicine: July 2020 - Volume 45 - Issue 7 - p 577-579 doi: 10.1097/RLU.0000000000003095 Buy Metrics Abstract 18F-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 99mTc-sestamibi imaging showed abnormal uptake in the neck nodule, which was confirmed as parathyroid adenoma by the pathology. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.