Aneurysm geometry in predicting the risk of rupture. A review of the literature

Neurol Res. 2014 Apr;36(4):308-13. doi: 10.1179/1743132814Y.0000000327. Epub 2014 Feb 5.


The management of unruptured aneurysms (UAs), whose incidence is increasing, is still a controversial issue. Many studies have been investigating the link between the geometry of the aneurysm and the risk of future rupture in order to bring forth a clear decision plan. The different estimators studied are the aneurysm's geometry and hemodynamic features on one hand, and the patient's clinical characteristics on the other. We reviewed the literature while focusing on the different geometrical parameters that have been used in estimating the future risk of rupture. These include mainly the size ratio (SR), the aspect ratio, the non-sphericity index (NI), the undulation index (UI), and the vessel aneurysm inclination angle (AA), to name a few.

Keywords: Aneurysm location,; Aneurysm morphology,; Aneurysm size,; Aspect ratio,; Bottleneck factor; Ellipticity index,; Neck type,; Non-sphericity index,; Rupture risk,; Size ratio,; Undulation Index,; Vessel geometry,; Volume-to-neck ratio,.

Publication types

  • Review

MeSH terms

  • Aneurysm, Ruptured / diagnosis*
  • Aneurysm, Ruptured / epidemiology*
  • Humans
  • Imaging, Three-Dimensional
  • Intracranial Aneurysm / pathology*
  • Prognosis
  • Risk