title: Hindbrain herniation: an unusual occurrence after shunting an intracranial arachnoid cyst. Case report.
abstract: The case is presented of a prepontine arachnoid cyst in a 28-year-old woman. She was treated by craniotomy, stereotactic aspiration, internal shunting, and finally by insertion of a cystoperitoneal shunt. Eight months later she developed an asymptomatic Arnold-Chiari type I malformation. The pathogenesis of this unusual hindbrain herniation is explained on the basis of the differential pressure between two compartments and cephalocranial disproportion.
authors.affiliation: Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
authors.forename: M I
authors.initials: MI
authors.lastname: Hassounah
authors.forename: B E
authors.initials: BE
authors.lastname: Rahm
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000601:surgery*; D004677:Encephalocele / Q000209:etiology*; D005260:Female; D006801:Humans; D012249:Rhombencephalon / Q000473:pathology*; D017287:Ventriculoperitoneal Shunt / Q000009:adverse effects*