Presentation
Incidental finding on a routine CT for chronic sinusitis.
Patient Data
Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
Bilateral aerated cavities lateral to the optic canal, extending into the anterior clinoid processes.
Case Discussion
CT showed bilateral aerated cavities lateral to the optic canal, extending into the anterior clinoid processes. These are variants of the utmost posterior ethmoid cells, named after the Hungarian rhinolaryngologist Adolf Onodi (1857-1919), as Onodi air cells or are otherwise known as sphenoethmoidal air cells.
Their importance is the close relation to the optic nerve and internal carotid artery and these can be potentially damaged during endoscopic sinus surgery if this variant is not recognized pre-operatively.
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