title: Synchronous choroid plexus papilloma of the fourth ventricle and ependymoma of the filum terminale: case report.
abstract: BACKGROUND
  We report the first case of synchronous choroid plexus papilloma of the fourth ventricle and myxopapillary ependymoma of the filum terminale. Both are papillary World Health Organization grade I tumors known to disseminate via cerebrospinal fluid pathways.
  
  
  METHODS
  A 65-year-old man presented with an incidental mass in the fourth ventricle found on a computed tomography scan of the head after a motor vehicle collision and an intradural mass of the filum terminale. The patient underwent resection of the fourth ventricle mass. After pathological diagnosis of a choroid plexus papilloma, the patient underwent resection of the spinal cord tumor.
  
  
  CONCLUSIONS
  This case underscores the need for separate pathological diagnosis in a patient with an intradural spine lesion in the context of a benign intracranial lesion. We detail a panel of immunohistochemical markers essential for distinguishing the 2 papillary neuroectodermal tumors recovered in this case.
authors.affiliation: Department of Neurosurgery, New York University School of Medicine, NYU Langone Medical Center, New York, New York, USA. robert.bollo@hsc.utah.edu
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Bollo
authors.forename: David
authors.initials: D
authors.lastname: Zagzag
authors.forename: Uzma
authors.initials: U
authors.lastname: Samadani
mesh_terms: D000368:Aged; D002420:Cauda Equina / Q000473:pathology / Q000601:surgery*; D016545:Choroid Plexus Neoplasms / Q000175:diagnosis / Q000601:surgery*; D004806:Ependymoma / Q000175:diagnosis / Q000601:surgery*; D006801:Humans; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis / Q000601:surgery*; D010524:Peripheral Nervous System Neoplasms / Q000175:diagnosis / Q000601:surgery*; D016896:Treatment Outcome