Tumor-induced osteomalacia (also known as oncogenic osteomalacia)1is a rare disorder characterized by phosphaturia, hypophosphatemia,and osteomalacia mimicking the clinical phenotype of eitherX-linked2 or autosomal dominant3 hereditary hypophosphatemicrickets. Tumor-induced osteomalacia develops because of tumorsthat are predominantly of benign mesenchymal origin4 but thatmay occasionally be malignant, as was recently reported.5 Surgicalremoval of the tumor relieves all symptoms. Hemangiopericytomais the most dominant histologic entity in tumor-induced osteomalacia.4,6Paraneoplastic secretion by the tumor of an unknown factor orfactors termed "phosphatonins" causing renaltubular phosphate wasting has been proposed as the pathogenicmechanism.7
Expression of mRNA for Matrix Extracellular Phosphoglycoprotein and Fibroblast Growth Factor 23
Results
Discussion
Source Information
From the Division of Endocrinology, Metabolism, and Molecular Medicine, Medizinische Poliklinik (J.S., K.E., F.J.); and the Departments of Pathology (J.M.), Orthopedic Surgery (J.E., C.H., N.S.), Nuclear Medicine (E.W.), and Radiology (G.S., W.K.), University of Würzburg both in Würzburg; the Division of Endocrinology of the Department of Internal Medicine I, University of Regensburg, Regensburg (K.-D.P.); and Tirschenreuth (H.R.) all in Germany.
Address reprint requests to Dr. Jakob at the Division of Endocrinology, Metabolism, and Molecular Medicine, Medizinische Poliklinik, University of Würzburg, Klinikstr. 6-8, 97070 Würzburg, Germany, or at jakob.medpoli@mail.uni-wuerzburg.de.
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