This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Communicating hydrocephalus most commonly results from deficient reabsorption of CSF absorption due to thickening of the leptomeninges - pia-mater and arachnoid - and / or damage to the arachnoid granulations. Causes include:

  • post-meningitis:
    • bacterial - pneumococcus more than meningococcus
    • tuberculosis
    • fungal
  • subarachnoid haemorrhage - 80% of cases develop some degree of hydrocephalus
  • trauma
  • neoplastic infiltration in the subarachnoid space
  • dural sinus thrombosis - not generally considered as a major cause of hydrocephalus

Less common mechanisms include:

  • increased CSF viscosity - high protein content
  • excess CSF production - choroid plexus papilloma

Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.