title: Delayed isolated tension intraventricular pneumocephalus after ventriculoperitoneal shunt.
abstract: OBJECTIVE
  Delayed and isolated tension intraventricular pneumocephalus without air in the pericerebral subarachnoid spaces is an exceptional complication of a ventriculoperitoneal (VP) shunt. We purpose an explanation for the development of such delayed pneumocephalus.
  
  
  METHODS
  A 14-year-old boy developed headaches and right-side hearing loss three months after surgical resection of a cerebellar medulloblastoma and insertion of a VP shunt. CT-scan showed isolated intraventricular pneumocephalus without air in the pericerebral subarachnoid spaces. A petrous bone defect was discovered and surgically repaired with clinical and radiographic resolution of pneumocephalus.
  
  
  CONCLUSIONS
  We presume that the brain tIssue plugging the bony defect retracted following the placement of the shunt and eventually there was rupture through the pia-mater into the lateral ventricle. This could explain why isolated intraventricular occurred, as opposed to air in the subarachnoid spaces.
authors.affiliation: Department of Neurosurgery, La Cavale Blanche Hospital, University of Bretagne Occidental, boulevard Tanguy-Prigent, 29200 Brest. jfmineo@hotmail.com
authors.forename: J-F
authors.initials: JF
authors.lastname: Mineo
authors.forename: D H
authors.initials: DH
authors.lastname: Phong
authors.forename: R
authors.initials: R
authors.lastname: Seizeur
authors.forename: Ph
authors.initials: P
authors.lastname: Mériot
authors.forename: G
authors.initials: G
authors.lastname: Besson
mesh_terms: D000293:Adolescent; D002528:Cerebellar Neoplasms / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008527:Medulloblastoma / Q000601:surgery; D019635:Neurosurgical Procedures; D010579:Petrous Bone / Q000002:abnormalities / Q000601:surgery; D011007:Pneumocephalus / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D013346:Subarachnoid Space / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D017287:Ventriculoperitoneal Shunt / Q000009:adverse effects*