Presentation
Right trigeminal neuralgia.
Patient Data
Age: 40 years
Gender: Male
From the case:
Anterior inferior cerebellar artery vascular loop - type II
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An incidental finding of a vascular loop of the right anterior inferior cerebellar artery (AICA) just approaching the entrance of the right internal auditory canal (IAC).
Both trigeminal nerves are normal.
Incidental mega cisterna magna.
Case Discussion
Vascular loop of the AICA is classified into 1:
- type I: vascular loop within the cerebellopontine angle level
- type II: vascular loop proximal to the IAC extends to less than 50% of the canal
- type III: vascular loop distal to the IAC extends to more than 50% of the canal