title: Extramedullary Conus Ependymoma Involving a Lumbar Nerve Root with Filum Terminale Attachment.
abstract: OBJECTIVE
  In the current report, we describe a case of an extramedullary ependymoma involving a lumbar nerve root near conus medullaris. Spinal ependymomas commonly present as intramedullary tumors in the cervical or thoracic cord or as tumors arising from the conus medullaris or the filum terminale. In this case, we showed an extramedullary conus ependymoma involving a lumbar nerve root with filum terminale attachment.
  
  
  METHODS
  A 69-year-old woman presented with lower back pain, but without sensory disturbance or motor weakness in her lower extremities.
  
  
  METHODS
  Magnetic resonance imaging revealed an intradural mass at T12-L1 at the conus medullaris, which was totally resected. Histopathology revealed a non-myxopapillary ependymoma (WHO grade 2). Postoperatively, the patient did well and displayed no neurological deficits. Moreover, no radiotherapy was required.
  
  
  CONCLUSIONS
  This report documented a rare case of intradural extramedullary ependymoma located at the conus medullaris, involving the lumbar nerve root, and attached to the filum terminale. Although extramedullary ependymomas at this region are more frequently classified as myxopapillary, histopathological examination revealed this tumor as a non-myxopapillary ependymoma.
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Moriwaki
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Iwatsuki
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Yu-Ichiro
authors.initials: Y
authors.lastname: Ohnishi
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Koshi
authors.initials: K
authors.lastname: Ninomiya
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Toshiki
authors.initials: T
authors.lastname: Yoshimine
keywords: ependymoma; intradural extramedullary spinal cord tumor; spinal tumor