title: A case of an intraventricular inflammatory pseudotumor presumably caused by Epstein-Barr virus infection.
abstract: BACKGROUND
  Inflammatory pseudotumor primarily affecting the CNS is an extremely rare lesion with uncertain etiology in most cases.
  
  
  METHODS
  A 67-year-old man developed involuntary movement disorder of the left upper extremity. On MRI, a solid homogeneously-enhanced tumor was noted in the right lateral ventricle adjacent to the thalamus. He had histories of right thalamic hypertensive hemorrhage and recurrent chronic nasal sinusitis associated with an orbital mass lesion, presumably an IP. Partial removal of the tumor yielded a diagnosis of IP associated with EBV infection.
  
  
  CONCLUSIONS
  The simultaneous occurrence of multiple IPs was presumably because of an exaggerated immune process after EBV infection. Inflammatory pseudotumor should be considered in any case of intraventricular mass lesion.
authors.affiliation: Department of Neurosurgery, Hachioji Medical Center, Tokyo Medical University, Tokyo 193-0998, Japan. nishioka@tokyo-med.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishioka
authors.forename: Makoto
authors.initials: M
authors.lastname: Shibuya
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakajima
authors.forename: Shingo
authors.initials: S
authors.lastname: Ohno
authors.forename: Yukio
authors.initials: Y
authors.lastname: Ikeda
mesh_terms: D000368:Aged; D001927:Brain Diseases / Q000175:diagnosis* / Q000628:therapy / Q000821:virology*; D020031:Epstein-Barr Virus Infections / Q000150:complications* / Q000175:diagnosis / Q000628:therapy; D006104:Granuloma, Plasma Cell / Q000175:diagnosis* / Q000628:therapy / Q000821:virology*; D006801:Humans; D020547:Lateral Ventricles; D008297:Male