Onodi cells

  • Onodi cells are the posterior most cells of the ethmoid sinus
  • It is located superolateral to the sphenoid sinus and is in close relation to the optic nerve
  • It may sometimes surround the optic nerve

Clinical importance:

  • Attempt to remove the onodi cells during sinus surgery may cause injury to the optic nerve
  • The onodi cells are a potential cause for incomplete sphenoidectomy
    • The anatomical landmarks of the sphenoid sinus correlate with that of onodi cells
    • Hence, the surgeon may mistakenly believe that the sphenoid sinus has been reached

Reference:
Otorhinolaryngology, Head and Neck Surgery By Matti Anniko, Manuel Bernal-Sprekelsen, Patrick Bradley

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