Cerebral angiography was performed, and an intracranial dAVF was found in the superior petrosal
sinus with perimedullary drainage [Figure 1]f and [Figure 1]g.
After identifying the important landmarks (greater superficial petrosal
nerve, arcuate eminence, superior petrosal
sinus, and superior semicircular canal), the roof of the internal auditory canal is drilled off to incise the intrameatal dura.
This process was long and difficult because this cavity was filled with sediments and partly recrystallized and because the petrosal
bone in cetaceans is particularly thick and dense, which lowers the quality of the images and sometimes impedes analyzing them," Orliac said in (https://www.
The hemorrhage is thought to be due to disruption of petrosal
and bridging cortical veins at the foramen magnum.
Tentorial detachment technique in the combined petrosal
approach for petroclival meningiomas.
3] Extension of the thrombus may be significant, reaching the superior petrosal
sinus superior, or as low as the subclavian vein.
The high-dose dexamethasone suppression test and bilateral inferior petrosal
sinus sampling can also help the etiologic diagnosis.
Superior and inferior ophthalmic veins, (SOV, IOV) drain into CS which in turn drain into the superior and inferior petrosal
sinuses [Figure 1].
1) It is formed by the union of the sigmoid and inferior petrosal
dural venous sinuses within the jugular foramen.
sinus sampling was performed to confirm the diagnosis of a central CD and revealed a central-to-peripheral ACTH gradient (cavernous/peripheral, Table 2).
The C2-C3 level permits an assessment of downward flow from the sigmoid sinus and inferior petrosal
sinus, which is in the uppermost portion of the extracranial region.
Higher levels of adrenocorticotropin hormone in petrosal
vasculature compared to cubital fossa indicates pituitary adenoma