title: Imaging features of meningeal inflammatory myofibroblastic tumor.
abstract: OBJECTIVE
  Meningeal inflammatory myofibroblastic tumor (IMT) has been rarely reported, and its prognosis is still unclear. Our purpose was to describe the imaging features of patients with meningeal IMT and their results on follow-up studies.
  
  
  METHODS
  Twenty-four MR images in 10 consecutive patients with pathologically proved meningeal IMTs were retrospectively evaluated, focusing on the lesion distribution, signal intensity (SI), and contrast-enhancement pattern with a review of the clinical records.
  
  
  RESULTS
  Eight patients with intracranial IMT showed localized (n = 4) or diffuse (n = 4) dural thickening, a single mass (n = 5) or 2 (n = 2) dural-based masses with surrounding edema, dural venous sinus thrombosis (n = 5), and leptomeningeal involvement (n = 5). Extracranial involvement of the mastoid (n = 2) and orbit (n = 2) was also associated. Each of the 2 patients with intraspinal IMT showed a dural-based mass and a segmental dural thickening, respectively. All of the thickened dura showed low SI on T2-weighted images, iso-SI on T1-weighted images, and diffuse contrast enhancement. Variable recurrences with dural-based masses, mastoid involvement, or nasolacrimal duct involvement were observed in all 4 patients with diffuse intracranial IMT, but not in the others.
  
  
  CONCLUSIONS
  Localized or diffuse dural thickening of T2 low SI and diffuse contrast enhancement combined with dural-based masses are a common MR imaging finding of meningeal intracranial IMT. Adjacent leptomeningeal involvement and dural venous sinus thrombosis are frequently associated. The diffuse type has a tendency toward recurrence.
authors.affiliation: Department of Radiology, Seoul National University Hospital, Seoul, Korea.
authors.forename: J-H
authors.initials: JH
authors.lastname: Kim
authors.forename: K-H
authors.initials: KH
authors.lastname: Chang
authors.forename: D G
authors.initials: DG
authors.lastname: Na
authors.forename: S-H
authors.initials: SH
authors.lastname: Park
authors.forename: E
authors.initials: E
authors.lastname: Kim
authors.forename: D H
authors.initials: DH
authors.lastname: Han
authors.forename: H-M
authors.initials: HM
authors.lastname: Kwon
authors.forename: C-H
authors.initials: CH
authors.lastname: Sohn
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yim
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis*; D008875:Middle Aged; D009187:Myelitis / Q000150:complications* / Q000175:diagnosis*; D009379:Neoplasms, Muscle Tissue / Q000150:complications* / Q000175:diagnosis*; D055815:Young Adult