title: Pineal region lesion masquerading choroid plexus papilloma: case report.
abstract: BACKGROUND
  Choroid plexus papillomas (CPPs) are rare intracranial neoplasms, especially in the third ventricle. We report a patient with a posterior third ventricular CPP extending into the pineal that radiographically and clinically presented as a pineal region lesion.
  
  
  METHODS
  In a 51-year-old female with headache and upward gaze impairment radiological examination showed a mass in the pineal region obstructing the aqueduct of Sylvius and causing hydrocephalus. After ventriculoperitoneal shunting the tumor was approached through the infratentorial-supracerebellar approach and pathological examination revealed a typical CPP.
  
  
  CONCLUSIONS
  This case represents an unusual presentation of an intracranial CPP. This entity should be considered an extremely rare cause of a lesion in the pineal region.
authors.affiliation: Department of Neurosurgery, Charite, Campus Virchow, Humboldt-University of Berlin, Berlin, Germany.
authors.forename: Stefan Nikolaus
authors.initials: SN
authors.lastname: Kroppenstedt
authors.forename: John
authors.initials: J
authors.lastname: Golfinos
authors.forename: Volker K H
authors.initials: VK
authors.lastname: Sonntag
authors.forename: Robert F
authors.initials: RF
authors.lastname: Spetzler
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D019635:Neurosurgical Procedures / Q000379:methods; D020288:Papilloma, Choroid Plexus / Q000473:pathology* / Q000601:surgery; D010871:Pinealoma / Q000473:pathology* / Q000601:surgery; D011182:Postoperative Care; D020542:Third Ventricle / Q000473:pathology / Q000601:surgery