=====Volume Embolization Ratio=====
The Volume [[Embolization]] Ratio (VER) for [[coiling]] was calculated using the following algebraic equation: VER = (volume of the embolized coil) / (volume of the aneurysm) * 100% 

The aneurysm volume was calculated before embolization as follows assuming that the aneurysm was ellipsoid: aneurysm volume (AV) = (4π/3) * (A/2) * (B/2) * (C/2), where A, B and C are the aneurysm length, width and height, respectively
((Zhang Y, Xing X, Shen X, Zhu X. The Volume Embolization Ratio of
Intraaneurysmal Embolization Using Guglielmi Detachable Coils. Turk Neurosurg.
2015;25(6):866-72. doi: 10.5137/1019-5149.JTN.7491-12.2. PubMed PMID: 26617134.
)).