title: Extramedullary ependymoma near the conus medullaris with lumbar nerve root attachment: case report.
abstract: BACKGROUND
  Ependymomas are the most common primary spinal cord tumor, most frequently located near the cauda equina and conus medullaris. We believe that this is the first reported case of a low-grade, nonmyxopapillary (World Health Organization grade 2), intradural, extramedullary ependymoma involving a spinal nerve root.
  
  
  METHODS
  An 87-year-old woman presented with a chief complaint of acute onset of severe right hip and lateral thigh pain without midline back pain. She had baseline chronic bladder dysfunction, which remained unchanged. Her physical examination was significant for 4/5 strength in her right hip flexion (possibly related to pain), and 5 beats of clonus bilaterally. She had no point tenderness at the level of her compression fracture. Computed tomography of the patient's lumbar spine revealed a well-corticated, chronic compression fracture of the L3 vertebral body. Magnetic resonance images demonstrated an ovoid-shaped, 1.5×1-cm, well-circumscribed, intradural, extramedullary lesion at the conus medullaris. The patient underwent an L1-3 laminectomy with intradural resection of the mass, which was found to be intricately involved with a single nerve root. The nerve root was coagulated and sectioned, and a gross total resection of the tumor was achieved.
  
  
  CONCLUSIONS
  The patient tolerated the procedure well, with no complications or any postoperative neurological deficit. Her right-sided pain immediately resolved after surgery. Her strength and ambulation were normal after surgery. No adjuvant radiotherapy was offered to the patient. This case illustrates a unique tumor presentation and the successful surgical treatment of the condition.
authors.affiliation: Department of Neurological Surgery, Division of Neuropathology, University of Pittsburgh Medical Center Pittsburgh, Presbyterian University Hospital, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Bonfield
authors.forename: Devin
authors.initials: D
authors.lastname: Amin
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Hamilton
authors.forename: Peter C
authors.initials: PC
authors.lastname: Gerszten
mesh_terms: D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008160:Lumbosacral Plexus / Q000473:pathology / Q000601:surgery; D010524:Peripheral Nervous System Neoplasms / Q000150:complications / Q000473:pathology* / Q000601:surgery*; D013117:Spinal Cord Compression / Q000175:diagnosis / Q000209:etiology* / Q000517:prevention & control*; D013126:Spinal Nerve Roots / Q000473:pathology* / Q000601:surgery*; D016896:Treatment Outcome