title: FGF23 Producing Mesenchymal Tumor.
abstract: A 40-year-old patient was referred to Clinic of Endocrinology due to hypophosphatemia causing pain, cramps, and weakness of muscles. Moreover, his bone mineral density was very low. The previous treatment with phosphorus and active vitamin D metabolites was ineffective. In lab tests the hypophosphatemia, hyperphosphaturia, and elevated FGF23 levels were found. Somatostatin receptor scintigraphy (SRS) showed increased radiotracer uptake in the right maxillary sinus and CT scans confirmed presence of tumor in this localization. Biopsy and cytological examination created suspicion of mesenchymal tumor-glomangiopericytoma. Waiting for surgery the patient was treated with long acting Somatostatine analogue, and directly before operation short acting Octreotide and intravenous phosphorus were used. Histology confirmed the cytological diagnosis and the phosphatemia return to normal values in 10 days after the tumor removal.
authors.affiliation: Clinic of Endocrinology, Medical Center of Postgraduate Education, Warsaw, Poland.
authors.forename: Lucyna
authors.identifier: 0000-0001-8390-7545
authors.initials: L
authors.lastname: Papierska
authors.affiliation: Department of Radiology, The Faculty of Medical Sciences, University of Warmia and Mazury, Olsztyn, Poland.
authors.forename: Jarosław B
authors.initials: JB
authors.lastname: Cwikła
authors.affiliation: Clinic of Endocrinology, Medical Center of Postgraduate Education, Warsaw, Poland.
authors.forename: Waldemar
authors.initials: W
authors.lastname: Misiorowski
authors.affiliation: Department of Internal Diseases, Diabetology and Endocrinology, Medical University of Warsaw, Warsaw, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Rabijewski
authors.affiliation: Department of Clinical Pathology, Central Clinical Hospital Ministry of Internal Affairs and Administration, Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Sikora
authors.affiliation: Clinic of Cranio-Maxillofacial Surgery, Medical University of Warsaw, Warsaw, Poland.
authors.forename: Hubert
authors.initials: H
authors.lastname: Wanyura