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Persistent trigeminal artery and its variants on MR angiography
Akira Uchino1, Naoko Saito, Yoshitaka Okada
1Department of Diagnostic Radiology, Saitama Medical University International Medical Center, 1397-1 Yamane, Hidaka, Saitama, 350-1298, Japan. auchino@saitama-med.ac.jp
Surgical and Radiologic Anatomy : SRA
|July 9, 2011
Summary
The persistent trigeminal artery (PTA) occurs in 0.34% of individuals, with variants found in 0.17%. Magnetic resonance angiography revealed most PTAs are lateral, and anterior inferior cerebellar artery (AICA) arises in most PTA variants.
Area of Science:
- Neuroimaging
- Vascular Anatomy
- Radiology
Background:
- The persistent trigeminal artery (PTA) is the most common connection between the carotid and vertebrobasilar systems.
- PTA variants involve cerebellar arteries arising from the internal carotid artery (ICA) without basilar artery connection.
Purpose of the Study:
- To determine the incidence of PTA and its variants.
- To classify these variations using magnetic resonance (MR) angiography.
Main Methods:
- Retrospective review of cranial MR angiography images from 3,491 patients.
- Exclusion of 135 patients due to ICA occlusion or poor image quality.
Main Results:
- 12 cases of PTA (0.34% incidence) and 6 PTA variants (0.17% incidence) were identified.
- 11 PTAs were lateral type, 1 medial. Superior cerebellar artery (SCA) arose from PTA in 2 cases.
- Anterior inferior cerebellar artery (AICA) arose from PTA variants in 5 cases, posterior inferior cerebellar artery (PICA) in 1.
Conclusions:
- MR angiography shows PTA incidence at 0.34% and variants at 0.17%.
- Left-sided PTAs were more common than right, though not statistically significant.
- Medial PTAs are rare; AICA is the most common cerebellar artery arising from PTA variants.
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