Isfahan University of Medical SciencesDental Research Journal1735-33275120090101Simultaneous Maxillary and Mandibular Brown Tumors in Secondary Hyperparathyroidism: A Case Report6666BijanMovahedianAssistant Professor, Department of Oral and Maxillofacial Surgery and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. b_movahedian@dnt.mui.ac.irSeyed MohammadRazaviDarioushHasheminiaMajidRezaei20101106Hyperparathyroidism (HPT) is a disease, which results from increased secretion of parathyroid hormone(PTH). Primary HPT results from autonomous hyperplasia or a tumor in parathyroid and secondaryHPT is usually associated with decreased calcium level due to chronic renal disease. Browntumors have been seen occasionally at the terminal stages of HPT. A case of 19-year-old man withhistory of end-stage renal disease (ESRD) demonstrating two expansive lesions in jaws is reportedhere. PTH and alkaline phosphatase (ALP) were extremely high and consequently, a diagnosis ofsecondary HPT was established. Contrary to the typical secondary HPT, the patient was normocalcemic.Computed tomography scan showed mixed radiolucent-radioopaque pattern of lesions andossifications were significant. Surgical excision was carried out and histology revealed presence offibro-endothelial connective tissue with broad areas of osteoids and numerous multinucleated giantcells, as seen in cases of brown tumors.Keywords: Alkaline phosphatase, brown tumors, hyperparathyroidism