Table 2. Vascular geometry in patients with and without iVADA growth.

Geometric characteristic	Growth (n=54)	No growth (n=70)	p
VTI	1.14±0.11	1.06±0.12	0.035
Size of aneurysm (mm)	6.88±3.00	6.24±2.79	0.248
BA–ipsiVA angle (degrees)	145.56±22.56	150.18±19.54	0.243
VA–VA angle (degrees)	57.03±28.02	49.62±26.08	0.144
Aneurysm ratio	2.83±1.32	2.42±0.83	0.054
BA diameter (mm)	3.10±0.91	3.16±0.65	0.677
VA diameter ratio	1.48±0.39	1.54±0.58	0.533
Ipsilateral dominant	24 (44.4)	33 (47.1)	0.765
Other cerebral aneurysm	11 (20.0)	13 (18.3)	0.397

Data are n (%) or mean±standard-deviation values. The VA diameter ratio was calculated by dividing the diameter at the initiation of the affected V4 segment by the diameter at the termination of the affected V4 segment. Other cerebral aneurysm refers to an aneurysm located in any intracranial and/or extracranial artery other than the ipsilateral or contralateral distal VA.

BA, basilar artery; ipsiVA, ipsilateral VA; iVADA, intracranial vertebral artery dissecting aneurysm; VA, vertebral artery; VTI, vertebral artery tortuosity index.