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Vascular Variations Associated with Intracranial Aneurysms.
Metin Orakdogen1, Selin Tural Emon, Hakan Somay
1Haydarpasa Numune Teaching and Research Hospital, Neurosurgery Clinic, Istanbul, Turkey.
Turkish Neurosurgery
|September 6, 2016
Summary
Vascular variations in the circle of Willis, particularly arterial hypoplasia and aplasia, were found in 57.8% of intracranial aneurysm patients. The anterior cerebral arterial system (ACS) showed the most variations, often on the right side.
Area of Science:
- Neuroscience
- Vascular Anatomy
- Radiology
Background:
- Intracranial aneurysms are associated with vascular anatomical variations.
- Understanding these variations is crucial for surgical planning and risk assessment.
Purpose of the Study:
- To investigate the prevalence and patterns of vascular variations in the circle of Willis among patients with intracranial aneurysms.
- To correlate these variations with aneurysm characteristics.
Main Methods:
- Retrospective analysis of cerebral angiography images from 128 intracranial aneurysm cases.
- Arteries were categorized into anterior (ACS), posterior (PCS), and middle (MCS) cerebral arterial systems.
- Evaluated lateralization, multiplicity, gender, and association with aneurysm number, location, and rupture status.
Main Results:
- Vascular variations were present in 57.8% of cases, with A1 variation being the most common (34.4%).
- Variations were most frequent in the ACS (36.7%), followed by PCS (24.2%) and MCS (10.2%).
- MCS variations were more prevalent in males; ACS variations correlated with higher rates of anterior communicating artery (ACoA) aneurysms and lower rates of posterior communicating artery (PCoA) and middle cerebral artery (MCA) aneurysms.
Conclusions:
- Vascular variations are common in patients with intracranial aneurysms, with arterial hypoplasia and aplasia being frequent.
- The ACS is the most common site for variations, often on the right side, and is associated with ACoA aneurysms.
- PCS variations are linked to PCoA aneurysms and a higher incidence of multiple variations, while MCS variations are more common in males.
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