Figure 1.
3D model of BTA aneurysm depicting morphological variables previously studied in the literature.
The aspect ratio (AR) is obtained by dividing the perpendicular height by the neck diameter. Size ratio (SR) is calculated by dividing the maximum height (Hmax) by the average composite diameter of the all vessels (BAv, RPCAv, LPCAv, RSCAv, LSCAv) involved with the aneurysm. Composite diameters are obtained by averaging the initial diameter of the vessel (BA1, RPCA1, LPCA1, RSCA1, LSCA1) at the vessel branching point by the aneurysm neck with the diameter of the vessel 1.5 away from the initial diameter (BA2, RPCA2, LPCA2, RSCA2, LSCA2). Aneurysm angle is defined as the angle between the vectors formed by the maximum height of the aneurysm with the aneurysm neck. The vessel angle is defined as the angle between the vector of flow and the neck of the aneurysm. The flow angle is defined as the angle between the vector of flow and the vector formed by the maximum height of the aneurysm.
Figure 2.
3D model of BTA aneurysm depicting angular variables of the surrounding vasculature.
There were three vessel to vessel angles -measured. The Parent-Daughter angle is a composite angle that refers to the average of the two angles formed between the basilar artery (BA) and each posterior cerebral artery (RPCA, LPCA). The P1-P1 angle refers to the angle formed between the two posterior cerebral arteries (RPCA, LPCA). The SCA-SCA angle refers to the angle formed between the two superior cerebellar arteries (RSCA, LSCA).
Table 1.
Demographic information and clinical risk factors for patients with basilar artery aneurysms.
Table 2.
Univariate analyses for the morphological parameters measured for basilar artery aneurysms.
Table 3.
Multivariate analyses for the morphological parameters measured for basilar artery aneurysms.