CST3 and Dilatation of the cerebral artery: The results showed that the AUC of serum cystatin C for predicting intracranial aneurysms was 0.6489 (95% CI: 0.5448–0.7530, P=0.0031), the sensitivity was 53.13% (95% CI: 41.07%–64.82%), the specificity was 95.65% (95% CI: 87.98%–98.81%), and the cutoff value was 0.59 mg/L (Figure 2(c)).