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. 2023 Jul 28;14:263. doi: 10.25259/SNI_344_2023

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Copyright: © 2023 Surgical Neurology International

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike 4.0 License, which allows others to remix, transform, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

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Figure 2: — Follow-up preoperative imaging findings. (a) Magnetic resonance angiography image obtained on day 7 showing mild stenosis of the right M1 portion (arrow). (b) Follow-up magnetic resonance angiography image obtained on day 13 showing progression of the stenosis from M1 to the M1-M2 bifurcation (arrow). (c) Three-dimensional computed tomography angiography image obtained on day 20 showing a small 2.5-mm saccular aneurysm on the superior wall of the M2 superior trunk (arrow). (d) Three-dimensional digital subtraction angiography image obtained on day 23 showing enlargement of the saccular aneurysm (arrow).