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Persistent trigeminal artery variants detected by MR angiography.
European Radiology
|November 30, 2000
Summary
Persistent trigeminal artery (PTA) variants, rare cerebellar arteries originating from the internal carotid artery (ICA), were found in 0.76% of MR angiograms. Recognizing these anomalous arteries is crucial for accurate cranial MR angiography interpretation.
Area of Science:
- Neuroimaging
- Vascular Neurology
- Anatomical Variants
Background:
- Persistent trigeminal artery (PTA) variants are anomalous cerebellar arteries.
- These arteries originate from the precavernous portion of the internal carotid artery (ICA).
Purpose of the Study:
- To determine the incidence of PTA variants.
- To describe the MR angiographic features of PTA variants.
Main Methods:
- Retrospective review of 523 cranial MR angiographies.
- Utilized a 1.5-T scanner with 3D TOF technique and MIP images.
- Stereoscopic display for enhanced visualization.
Main Results:
- Four PTA variants were detected, with an incidence of 0.76%.
- Three of the four variants were identified as anterior inferior cerebellar arteries (AICAs).
- AICAs arose from the precavernous ICA and coursed posteriorly.
Conclusions:
- PTA variants, though clinically minor, have a notable incidence.
- Recognition of these anomalous cerebellar arteries is important for interpreting cranial MR angiograms.