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Hydrocephalus - Coggle Diagram

- - - - arises in midline of post fossa
      - may seed in CSF - 20% have spine mets @ dx
    - - arises from squamous remnant of Rathke pouch (gives rise to ant pit)
      - not truly malignant but locally invasive
      - grows slowly in suprasellar region
  - - - tx hydrocephalus
      - provide tissue dx
        
        not always possible due to anatomic position (e.g. brainstem)
      - attempt max resection
- - - - blockage
      - infection (coag -ve staph)
      - overdrainage
        
        can cause low pressure headaches
        
        insertional of regulatory valve can help avoid this
- - - - aqueduct stenosis
      - Dandy-Walker mallformation
        
        atresia of outflow of 4th ventricle
      - Chiari malformation
        
        brain tissue extends into spinal canal