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The abducens nerve exits the pons, runs along the bony clivus, enters the cavernous sinus through Dorello's canal, and subsequently runs through the middle of the cavernous sinus in close relation to the internal carotid artery medial to CN III, IV, and V [5, 6].
Detailed magnetic resonance imaging anatomy of the cisternal segment of the abducens nerve: Dorello's canal and neurovascular relationships and landmarks.
The classic Gradenigo syndrome triad is completed with the addition of diplopia due to involvement of the abducens nerve in the Dorello canal in the petroclival region and deafness due to concurrent suppurative otitis media (2, 21).
Later, in 1872, Italian anatomist Primo Dorello conducted a more detailed study of this area, which describes the connection between the apex and posterior clinoid process forms a hollow bone, ligament and the petrosphenoidal close this concavity at its upper edge forming one fibro osseous canal, often referred to by the eponym of "Dorello's canal" (Forbis, 1998).
Most commonly the sixth nerve is affected resulting in lateral rectus palsy due to its relatively longer course of exposure as it ascends from the pontomedullary junction to the petrous apex and Dorello's canal.
* 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.
There the nerve makes a sharp anterior turn (almost at right-angles) to pass through a narrow (Dorello's) canal beneath the petroclinoidal ligament, which tethers it to the petrous apex.
They usually experience persistent headache (usually frontal) and early abducent nerve paralysis caused by apical involvement and extension into Dorello's canal.
Magnetic Resonance Imaging revealed hyperintensity in T1 axial flair and T2 weighted images in both mastoid air cells and petrous apex involving Dorello's canal and Meckel's cave area on right side.