Types of Hydrocephalus



Noncommunicating hydrocephalus or internal hydrocephalus (Congenital)

  • result from congenital abnormalities in the ventricular system
  • mass lesion such as tumor that compresses the structures of the ventricular system
  • impaired absorption of the CSF from the subarachnoid space occurs when an obstructive process disrupts its flow through the subarachnoid space
  • fluid is then prevented from reaching the convex portion of the cerebrum, where the arachnoid granulations are located.

Communicating hydrocephalus

  • Hydrocephalus from impaired absorption may be caused by adhesions from inflammation as with meningitis or subarachnoid hemorhage, compresion of the subarachnoid space by a mass
  • congenital abnormalities of the subarachnoid space
  • high venous pressure within the sagital sinus
  • d/t subarachnoid hemorrhage
  • d/t developmental malformation
  • d/t neoplasm

Normal-Pressure Hydrocephalus (Acquired)

  • occurs mostly in late middle age
  • caused by arachnoid adhesions that obstruct the subarachnoid space
  • most frequently seen as a complication of head injury

Tx: Management of intracranial pressure with surgical shunt incision.


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