title: Inverted papilloma: evaluation with MR imaging.
abstract: The authors examined the magnetic resonance (MR) appearance of inverted papillomas to determine if this histologically benign lesion could be distinguished from malignancies of the sinonasal cavity. MR images in 10 patients with histologically proved inverted papilloma were retrospectively reviewed. The signal intensity of inverted papillomas on short repetition time (TR) images was iso- to slightly hypertintense to muscle in all 10 patients. Inverted papillomas had intermediate signal intensity on the long TR/echo time (TE) images. The tumors were iso- or slightly hypointense to fat on long TR/short TE images. In the seven patients who received gadopentetate dimeglumine, all inverted papillomas showed solid inhomogeneous enhancement. A review of eight sinonasal malignancies showed no distinctive signal intensity or enhancement characteristics to help differentiate inverted papillomas from various malignant tumors. The authors conclude that there is no signature MR appearance for the benign inverted papilloma. The main utility of MR imaging is in defining the extent of the lesion.
authors.affiliation: Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104.
authors.forename: D M
authors.initials: DM
authors.lastname: Yousem
authors.forename: D W
authors.initials: DW
authors.lastname: Fellows
authors.forename: D W
authors.initials: DW
authors.lastname: Kennedy
authors.forename: W E
authors.initials: WE
authors.lastname: Bolger
authors.forename: H
authors.initials: H
authors.lastname: Kashima
authors.forename: S J
authors.initials: SJ
authors.lastname: Zinreich
mesh_terms: D000273:Adipose Tissue / Q000473:pathology; D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis; D003287:Contrast Media; D005152:Facial Muscles / Q000473:pathology; D005260:Female; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009296:Nasal Cavity / Q000473:pathology*; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis; D009669:Nose Neoplasms / Q000175:diagnosis*; D010212:Papilloma / Q000175:diagnosis*; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media