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. 2021 Jan 15;11:598740. doi: 10.3389/fneur.2020.598740

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Copyright © 2021 Zhu, Li, Tian, Zhang, Zhang, Wang, Zhang, Yang and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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A nomogram to estimate the risk of small aneurysm instability based on preoperative clinical and morphological risk factors. The nomogram was developed in the derivation cohort based on five independent risk factors: location, irregularity, sidewall/bifurcation type, flow angle, and height-width ratio. To use the nomogram, find the position of each variable on the corresponding axis, draw a line to the points axis for the number of points, add the points from all of the variables, and draw a line from the total points axis to determine the risk of aneurysm instability at the lower line of the nomogram.