title: Mesenchymal phosphaturic neoplasm in the maxillary sinus: a case report.
abstract: The authors describe a case of oncogenic osteomalacia due to a mesenchymal phosphaturic tumour in the maxillary sinus. This is a paraneoplastic syndrome in which a tumour produces a peptide hormone-like substance (phosphatonin) that causes a urinary loss of phosphates resulting in a debilitating systemic condition. In this case, the patient experienced muscle stiffness, reduction of muscle tone, loss of weight and pathological fractures. Clinical and radiological examination revealed a tumour in the right maxillary sinus; all other results were negative. The diagnosis following pathology examination was mesenchymal phosphaturic tumour with a haemangiopericytoma-like vascular pattern. Different histological types of mesenchymal tumours can be associated with paraneoplastic syndrome, but their localization in the paranasal sinuses is rare. The correct diagnosis allows the appropriate therapeutic approach, which can lead to an almost immediate resolution of the clinical situation after surgical removal of the neoplasm as in the present case. Oncogenic osteomalacia is rare, particularly in the maxillofacial region, and only a few cases have been reported.
authors.affiliation: Department of Maxillo-Facial Surgery, San Paolo Hospital, University of Milan, Via A. Di Rudinì 8, Milan, Italy. marcomxf@gmail.com
authors.forename: M
authors.initials: M
authors.lastname: Pedrazzoli
authors.forename: G
authors.initials: G
authors.lastname: Colletti
authors.forename: M
authors.initials: M
authors.lastname: Ferrari
authors.forename: G
authors.initials: G
authors.lastname: Rossetti
authors.forename: L
authors.initials: L
authors.lastname: Moneghini
authors.forename: L
authors.initials: L
authors.lastname: Autelitano
mesh_terms: D000328:Adult; D005260:Female; D000089703:Fibroblast Growth Factor-23; D005346:Fibroblast Growth Factors / Q000032:analysis; D005500:Follow-Up Studies; D005598:Fractures, Spontaneous / Q000209:etiology; D006801:Humans; D006996:Hypocalcemia / Q000209:etiology; D017674:Hypophosphatemia / Q000209:etiology; D008444:Maxillary Sinus Neoplasms / Q000150:complications* / Q000175:diagnosis; D008637:Mesenchymoma / Q000150:complications* / Q000175:diagnosis; D009129:Muscle Tonus; D009135:Muscular Diseases / Q000209:etiology; D010018:Osteomalacia / Q000209:etiology*; D010257:Paraneoplastic Syndromes / Q000209:etiology*; D010710:Phosphates / Q000652:urine; D015431:Weight Loss
chemical_list: D010710:Phosphates; D005346:Fibroblast Growth Factors; D000089703:Fibroblast Growth Factor-23