It has been suggested that this compression may be related to an aberrant branch of the superior cerebellar artery that lies on the trigeminal nerve.
2.
It has a variable course, passing backward to be distributed to the anterior part of the undersurface of the cerebellum, posterior inferior cerebellar ( PICA ) branch of the vertebral artery and the superior cerebellar artery.
3.
It passes between the posterior cerebral artery and the superior cerebellar artery, and then pierces the dura just under free margin of the tentorium cerebelli, close to the crossing of the attached margin of the tentorium and within millimeters of the posterior clinoid process.
4.
It was once believed that the nerve was compressed in the opening from the inside to the outside of the skull; but leading research indicates that it is an enlarged or lengthened blood vessel most commonly the superior cerebellar artery compressing or throbbing against the microvasculature of the trigeminal nerve near its connection with the pons.
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