title: MR manifestations of subependymomas.
abstract: OBJECTIVE
  To provide a description of the MR and enhanced MR appearances of subependymomas.
  
  
  METHODS
  We reviewed the MR examinations of eight cases of pathologically proved subependymomas and correlated them with operative and pathologic reports, and also reviewed the previous published cases of subependymomas documented by MR. Gadopentetate dimeglumine-enhanced MR examination was performed in seven cases.
  
  
  RESULTS
  One patient presented with four subependymomas, two patients had subependymomas of the cervical spine, and the others were intraventricular with no transependymal extension. They were isointense to hypointense relative to normal white matter on T1-weighted images, heterogeneous in five cases. Minimal (n = 1) or no (n = 3) enhancement was noted in four cases, and moderate or marked enhancement was noted in three cases.
  
  
  CONCLUSIONS
  We conclude that even though there is no specific sign of subependymomas, when confronted with a complete intraventricular lesion or with a spinal lesion causing little or no edema which is minimally enhancing or nonenhancing, one must consider the diagnosis of subependymoma.
authors.affiliation: Department of Neuroradiology and Therapeutic Angiography, Hôpital Lariboisière, Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Hoeffel
authors.forename: M
authors.initials: M
authors.lastname: Boukobza
authors.forename: M
authors.initials: M
authors.lastname: Polivka
authors.forename: G
authors.initials: G
authors.lastname: Lot
authors.forename: J P
authors.initials: JP
authors.lastname: Guichard
authors.forename: F
authors.initials: F
authors.lastname: Lafitte
authors.forename: D
authors.initials: D
authors.lastname: Reizine
authors.forename: J J
authors.initials: JJ
authors.lastname: Merland
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D005260:Female; D018315:Glioma, Subependymal / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013116:Spinal Cord / Q000473:pathology; D013120:Spinal Cord Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery