Vascular Variations Associated with Intracranial Aneurysms.

Turkish neurosurgery

PubMedID: 27593836

Orakdögen M, Emon ST, Somay H, Engin T, Is M, Hakan T. Vascular Variations Associated with Intracranial Aneurysms. Turk Neurosurg. 2016;.
AIM
Investigation of the vascular variations in patients with intracranial aneurysm in circle of Willis.

MATERIAL AND METHODS
We used the data on 128 consecutive intracranial aneurysm cases. Cerebral angiography images were analyzed retrospectively. Arteries grouped as anterior cerebral arterial system (ACS), posterior cerebral arterial system (PCS) and middle cerebral arterial system (MCS) for grouping vascular variations. Lateralization, being single/multiple, gender; and also any connection with accompanying aneurysm's number, localization, dimension, being bleeding/incidental aneurysm has been inspected.

RESULTS
Variations were demonstrated in 57.8 % of the cases. The most common variation was A1 variation (34.4 %). The rate of variations was 36.7 %, 24.2 % and 10.2 % respectively in ACS, PCS and MCS. MCS variations was significantly higher in males. Anterior communicating artery (ACoA) aneurysm observance rates were significantly higher and posterior communicating artery (PCoA) aneurysm and middle cerebral artery (MCA) aneurysm observance rates were significantly lower when compared to 'no ACS variation detected' cases. In 'PCS variation detected' cases, PCoA aneurysm observance rates and coexistence of multiple variations were significantly higher.

CONCLUSION
The rate of variations with aneurysms was 57.8 %. Arterial hypoplasia and aplasia were the most seen variations. ACS was the most common region that variations were located; they were mostly detected on right-side. Coexistence of ACoA aneurysm was higher than PCoA and MCA aneurysms. In PCS variations group, PCoA aneurysms were the most common aneurysms that accompanying to variation and multiple variations were more than the other two groups. The variations in MCS were most common in males.