title: Proptosis from maxillary sinus inverted papilloma with malignant transformation.
abstract: We describe a 58-year-old woman who presented with proptosis, upward displacement, and decreased vision in her right eye. A computed tomography scan revealed a mass filling the right maxillary sinus, destroying bone and invading the inferolateral orbit. The tumor proved to be an inverted squamous papilloma with focal transformation to squamous cell carcinoma. Although a rare cause of proptosis, inverted papilloma with orbital invasion must be considered when a patient describes associated nasal or sinus disease.
mesh_terms: D001706:Biopsy; D002294:Carcinoma, Squamous Cell / Q000150:complications* / Q000473:pathology; D005005:Ethmoid Sinus / Q000473:pathology; D005094:Exophthalmos / Q000209:etiology* / Q000473:pathology; D005260:Female; D006801:Humans; D008443:Maxillary Sinus / Q000473:pathology; D008444:Maxillary Sinus Neoplasms / Q000150:complications* / Q000473:pathology; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D010212:Papilloma / Q000150:complications* / Q000473:pathology; D010255:Paranasal Sinus Neoplasms / Q000150:complications*