Type III (temporal extended FLA): A Type III FLA was performed for lesions that invaded the greater wing of the sphenoid bone, sphenoidal ridge, anterior clinoid process, cavernous sinus, and the third ventricle.
Tumors invaded the greater wing of the sphenoid bone in one case, anterior clinoidal process in one case, olfactory groove or sphenoidal platinum in ten cases, cavernous sinus in two cases, and the third ventricle in eight cases.
36) The lateral sphenoid cephalocele can be further divided into type 1 (which herniates into a pneumatized lateral recess, may simulate a retention cyst on CT, and may present with CSF leak and headache) and type 2 (which herniates into or through the greater wing of the sphenoid bone
and may present with seizure or headache).
DISCUSSION: In primate evolution, the anterosuperior segment of the squamous part of the temporal bone of lower primates became detached from its parent and incorporated into the posterosuperior angle of the greater wing of the sphenoid bone
of humans, thereby changing the pterion pattern from the frontotemporal type of nonhuman primates to the sphenoparietal type of humans (9).
These recurrent lesions tended to involve the greater wing of the sphenoid bone
Garcia (3) reported one case and Leblanc et al (4) reported three in which a bony defect in the base of the greater wing of the sphenoid bone near the foramen rotundum allowed a meningoencephalocele to protrude into the pterygopalatine fossa.
Leblanc et al hypothesized that a failure in ossification occurs at the base of the greater wing of the sphenoid bone in the region of the foramen rotundum and pterygoid process.
High-resolution computed tomography (CT) of the skull base demonstrated a bony overgrowth, with sclerosis of the left temporal bone (particularly in the squamous portion and in the anterior part of the petrous pyramid) and the left greater wing of the sphenoid bone