A Benign Pathology Mimicking Multiple Bone Metastasis On F-18 Fdg-Pet/Ct: Brown Tumor

\n Brown tumors are benign, but locally aggressive tumors that may emerge as a rare complication of prolonged hyperparathyroidism. They may be clinically and radiologically confused with bone metastases. Browns tumors show increased metabolic activity on F-18 FDG-PET/CT just as metastatic bone lesions. In this study, we present a patient who underwent PET/CT to seek a primary focus with the presumed diagnosis of  multiple bone metastasis, and Brown tumor was suspected because no primary focus was detected on imaging and increased FDG enhancement was seen in parathyroid locations, and the diagnosis was confirmed with further investigations. Herein, we aimed to underline that Brown tumors should be kept in mind in the differential diagnosis in patients who are clinically and radiologically considered to have bone metastasis.