pierces the dura below the posterior clinoids
and angles forward over the tip of the petrous bone, passing through or around the inferior petrosal sinus, through the Dorello canal (under the petroclinoid ligament) to enter the cavernous sinus (Fig.
Anteriorly, it is bounded by a bony ridge, the tuberculum sella, and posteriorly by the dorsum sella and the posterior clinoid
Microscopic dissection clearly determined the mass to be extra-axial, growing from the anterior clinoid
region superiorly toward the brain.
The oculomotor nerve pierces the dura lateral to the posterior clinoid
process and traverses the cavernous sinus, before dividing.
A spinner dolphin, Stenella longirostris, from the Gulf of Mexico has both an anterior and a posterior clinoid
process bordering its sella turcica.
One explanation for isolated oculomotor nerve palsy in sphenoid sinus mucocele is that the sinus expands anteriorly at the level of the anterior clinoid
process where the oculomotor nerve is closest to the sinus.
The tumor also extended posteriorly along the base of the cranial vault, destroying the pterygoid plates inferiorly and the clinoid
Enhancement was also noted along the anterior clinoid
Superiorly, the lesion extended into the sellar area and eroded the right anterior clinoid