title: Intraoral mass presenting as maxillary sinus carcinoma: a case report.
abstract: Sinonasal undifferentiated carcinoma is an extremely rare malignancy of the paranasal sinuses and nasal cavity. It is of unknown etiology, and occurs more commonly in the elderly men, with a routinely shown aggressive behavior and poor prognosis for survival. Radiographically, it looks like severe osteomyelitis. Histopathologic study is essential to confirm diagnosis, and the undifferentiated histologic appearance often necessitates immunohistochemical studies for differentiation from other high-grade neoplasms. We present an 83-year-old man complaining of pain and unilateral swelling on the left side of the face due to a rare malignant tumor of maxillary sinus origin, a sinonasal undifferentiated carcinoma. He underwent hemimaxillectomy and radiotherapy, but refused chemotherapy. Maxillary sinus malignancy may be presented with unspecific symptoms mimicking sinusitis or dental pain. Coming across such symptoms, the physician or dentist must consider malignancies as well, and carry out medical and dental workups.
authors.affiliation: Assistant Professor, Department of Oral and Maxillofacial Medicine, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Omid
authors.initials: O
authors.lastname: Mahdavi
authors.affiliation: Resident, Department of Anesthesiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Najmehalsadat
authors.initials: N
authors.lastname: Boostani
authors.affiliation: Assistant Professor, Department of Oral and Maxillofacial Medicine, School of Dentistry, Kurdistan University of Medical Sciences, Sanandaj, Iran.
authors.forename: Sharareh
authors.initials: S
authors.lastname: Karimi
authors.affiliation: Resident, Department of Oral and Maxillofacial Medicine, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Adel
authors.initials: A
authors.lastname: Tabesh
keywords: Maxillary Sinus Neoplasms; Sinonasal Undifferentiated Carcinoma