mucoceles are rare entities that can cause devastating ocular complications if not treated promptly.
Optic neuropathy and acute visual loss caused by an isolated mucocele of an Onodi cell
have been reported.
This being an Onodi cell
, while operating on this patient the surgeon should be aware of this variation as there is an increased risk of injuring the optic nerve.
The scans were reviewed for the presence of deviated nasal septum, paradoxical middle turbinate, Haller cell, Onodi cell
, and pneumatisation of the middle turbinate and uncinate process.
The most posterior point of an onodi cell
of the posterior ethmoid may extend upto 1.
So, for visualising bulla ethmoidalis and other hidden ethmoidal air cells like Haller cell and Onodi cell
, CT PNS is the investigating modality of choice beyond doubt.
This is important because approaching laterally and superiorly through the lateral portion of the ethmoid sinus could easily injure the optic nerve, or in the case of an Onodi cell
, cause entry into the intracranial cavity.
Presence of horizontal septations in the sphenoid sinus were indicative of an Onodi cell
Dissection of the left posterior ethmoid cells revealed the presence of a superior Onodi cell
(sphenoethmoid cell) above the sphenoid sinus (figure, B).
On coronal CT, an Onodi cell
is seen above the sphenoid sinus.
In what year, according to Christmas et al (Rhinoscopic Clinic), was the Onodi cell
Endoscopic sinus surgery in patients who have an Onodi cell
(sphenoethmoid cell) carries a high risk for optic nerve injury.