Fig 1. Construction of the auxiliary elements and angular measurements in sidewall and bifurcation aneurysms.

Inflow angle α was determined by the aneurysm neck section line and the centerline of the afferent vessel close to the aneurysm. The angle close to the aneurysm neck (δ₁) and more remote from the aneurysm neck (δ₂) were determined by centerlines of the efferent and afferent vessel close (δ₁), respectively, located more remotely from the aneurysm neck (δ₂).