Advances in determining abdominal aortic aneurysm size and growth

Table 2 Summary of studies comparing between orthogonal diameter computed tomography and volume measurements

Ref.	Journal, yr	Population	Definition of size-change	Main results
Wever et al[45]	Eur J Vasc Endovasc Surg, 2000	Post-EVAR	LOAs	37%, discordance Dmax and volume measurements. A decrease in aneurysm size was missed using Dmax in 14% of cases and an increase in 19% of cases
Prinssen et al[46]	Eur J Vasc Endovasc Surg, 2003	Post-EVAR	NA	Volume data resulted in more "good/wait" while Diameter data resulted in more "not good/further diagnostics"-decisions
Kritpracha et al[42]	JEVT, 2004	Post-EVAR	10% for volume, 5 mm for diameter	Volume changed in 81% of studies (15% increase and 66% decrease). Dmax changed 57% (4% increase and 53% decrease). Among 20 studies with increased volume, Dmax increased in only 5
van Keulen et al[43]	J Endovasc Ther, 2009	Post-EVAR	5% for volume, 5 mm for diameter	Volumetry detected aneurysm growth in 24% and shrinkage in 54% of patients, which was reflected by Dmax in 10.6% and 28% respectively
Parr et al[40]	Eur J Radiol, 2011	Small AAAs	LOAs	42% of patients who had increased aortic volume did not display corresponding diameter changes
Kauffmann et al[41]	Eur J Radiol, 2012	Small AAAs	LOAs	4/28 (14.3%) patients presented volume increase which was not reflected in Dmax
Kontopodis et al[44]	Eur J Radiol, 2014	Small AAAs	LOAs	18% of patients who had increased aortic volume did not display corresponding diameter changes. AAAs presenting rapid volume increase had a 10-fold risk to be operated, while the risk was 3-fold for rapid Dmax increase

LOAs: Limits of agreement; AAA: Ab dominal aortic aneurysm; EVAR: Endovascular aneurysm repair; NA: Not available.