Investigation of Contrast Retention in PCOM Aneurysms as a Possible Marker for Instability and Rupture.

However, due to the smaller sample size of the longitudinal dataset, the association between flow stagnation and aneurysm instability only reached marginal significance (94% confidence). 3.3 Predictive Models of IA Rupture and Instability Based on Contrast Retention Metrics The performance of multivariate logistic regression models of aneurysm rupture (all and smaller than 7 mm) and instability following the stepwise variable selection based on the AIC are presented in Table 3 and Figure 2 .

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