Grading of EVD Placement

  1. Grade I
    • optimal placement in the ipsilateral frontal horn or third ventricle
  2. Grade 2
    • functional placement in the contralateral ventricle or noneloquent (parenchyma)
  3. Grade 3
    • suboptimal placement in the eloquent cortex [(parenchyma) or nontarget CSF space, with or without functional drainage


Kakarla, Udaya K. et al. “Safety and accuracy of bedside external ventricular drain placment”. Operative Neurosurgery 63 (2008): ONS162-ONS167.



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