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Concomitant completeley ossified trigeminal pore and Dorello's canal.

Commonly, the trigeminal and abducens nerve course to the middle cranial fossa, beneath the tentorial border (posterior petroclinoid dural ligament) and, respectively, beneath Grüber's petrosphenoidal ligament, in Dorello's canal. It is hereby reported a rare unilateral association of anatomic variants which was found when the brain computed tomography angiography of a 56 y.o. male patient was observed. On the left side the tentorial border was ossified above the petrous apex, resulting a tentorial bar long of 1.96 cm that transformed the trigeminal pore into a completely ossified one. On that side was also found an ossified petrosphenoidal ligament determining a completely ossified Dorello's canal. On the opposite side a 2.9 mm long clinoid bar extended from the posterior clinoid process to the anterior one. Although these bars are not common for humans they should be documented in computed tomography in cases with associated trigeminal neuralgia and abducens nerve palsy.