Changes of size and shape of small, unruptured XXXX in repeated computed tomography angiography studies.

@entity1 @entity438 @entity397 @entity439 @entity1756
INTRODUCTION: Unruptured @entity438 (UIAs) are frequently detected in noninvasive imaging studies such as computed tomography angiography (CTA) or magnetic resonance angiography (MRA). If small, UIAs are observed in these modalities in order to detect growth or shape change, but there are many questions about proper protocol of the follow-up. AIM: To assess changes of small (< 7 mm) UIAs dome size and shape in repeated CTA studies as predictors of growth and @entity397 . MATERIAL AND METHODS: One hundred and ten UIAs (10 posterior circulation) in 70 @entity1 (55 @entity1 ) were observed, with a cumulative observation time of 333.32 years. @entity439 ' dome and neck perpendicular dimensions were measured in the first and the last CTA study at least twice with the developed application. Confidence intervals (CI) for measurements and dome shape parameters were calculated. For @entity439 ruptured during follow-up intermediate studies were analyzed. @entity1 ' clinical information was recorded. The @entity439 growth detection algorithm integrated CI and spatial resolution of the CT scanner. RESULTS: Twenty-three @entity439 increased in volume, 10 in height and 14 in dome width. Volume increased in 90% of cases of height and 93% of width increase. Posterior circulation @entity439 grew faster than anterior ones (p < 0.003), but calculated time to significant size increase (eT) did not differ between the groups due to higher CI in the posterior circulation. Analysis of eT with Kaplan-Meier curves showed that 75% of growing @entity439 could be detected in the first 3 years of observation. During the follow-up 3 @entity439 bled, and they grew faster than other growing @entity439 . Two of the bleeding @entity439 formed daughter sacs. CONCLUSIONS: Dome volume assessment is superior to single dimension assessment in @entity439 growth detection. Confidence intervals assessment helps to avoid overestimation of growth. Seventy-five percent of growing @entity439 could be detected in the first 3 years of observation. Daughter sac formation and fast increase in size are strong predictors of @entity1756 .
