title: Fibrosing inflammatory pseudotumor of the nasopharynx: MR features and histopathologic correlation.
abstract: OBJECTIVE
  To describe the magnetic resonance (MR) imaging features of six cases of pathologically proven fibrosing inflammatory pseudotumor involving the nasopharynx, and to compare the MR signal intensities of the lesions with histopathologic findings.
  
  
  METHODS
  We reviewed the MR finding of six patients with pathologically proved fibrosing inflammatory pseudotumor at the nasopharyngeal wall with respect to the following points: extent, margins, signal intensity and enhancement degree of the lesion; cervical lymphadenopathy and response to steroid therapy. MR findings were correlated with histopathologic findings.
  
  
  RESULTS
  All lesions showed ill-defined margins and looked less-likely contour bulging features. The signal intensity of the lesions was hypointense or slightly heterogeneous relative to brain cortex on both T1- and T2-weighted images, and enhancement was weakly homogeneous in all cases. There was no demonstrable cervical lymphadenopathy in all cases. After steroid therapy, the lesions showed decreased extent and weaker enhancement in three patients. Histopathologic findings showed high degree of polymorphous inflammatory cellular infiltration with underlying significant reactive fibrosis.
  
  
  CONCLUSIONS
  Fibrotic inflammatory pseudotumors involving nasopharynx are very rare, and can mimic malignancy. MR imaging showed ill-defined margins, hypointensity or slightly heterogenous signal intensity on T2-weighted image and weak enhancement. There was no significant cervical lymphadenopathy.
authors.affiliation: Department of Radiology, Eulji University Hospital, 1306 Dunsan-dong, Seo-gu, Daejeon, South Korea.
authors.forename: So-Young
authors.initials: SY
authors.lastname: Choi
authors.forename: In Kyu
authors.initials: IK
authors.lastname: Yu
authors.forename: Moon Hee
authors.initials: MH
authors.lastname: Han
authors.forename: Byung-Hee
authors.initials: BH
authors.lastname: Lee
authors.forename: Chang Joon
authors.initials: CJ
authors.lastname: Song
authors.forename: Kyu Soon
authors.initials: KS
authors.lastname: Kim
mesh_terms: D000328:Adult; D005260:Female; D005355:Fibrosis; D006104:Granuloma, Plasma Cell / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009302:Nasopharyngeal Diseases / Q000473:pathology*; D013223:Statistics as Topic