RT Journal Article SR Electronic T1 Extraaxial ependymoma of the posterior fossa. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1179 OP 1181 VO 18 IS 6 A1 M B Fukui A1 J P Hogg A1 A J Martinez YR 1997 UL http://www.ajnr.org/content/18/6/1179.abstract AB We report an unusual case of an extraaxial ependymoma of the posterior fossa in an adult. MR imaging showed a heterogeneously enhancing extraaxial mass with a cystic component. Ependymoma should be included in the differential diagnosis of uncommon extraaxial masses of the posterior fossa.