Aspect ratio (AR)

Significant differences between anterior circulation aneurysm and posterior circulation intracranial aneurysm were found for the aspect ratio (AR) (1.91 ± 0.8 vs. 2.75 ± 1.8; p = 0.02) 1).

(AR = aneurysm dome depth/neck size)

h: aneurysm dome depth

n: neck size or wide

a: parent artery size

1)
Tykocki T, Kostkiewicz B. Aneurysms of the anterior and posterior cerebral circulation: comparison of the morphometric features. Acta Neurochir (Wien). 2014 Sep;156(9):1647-54. doi: 10.1007/s00701-014-2173-y. Epub 2014 Jul 19. PubMed PMID: 25034507; PubMed Central PMCID: PMC4137168.