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. 2025 May 31;11(2):148-152.
doi: 10.4103/bc.bc_85_24. eCollection 2025 Apr-Jun.

Giant M1 segment aneurysm: Illustration of the importance of cross-sectional ratio of aneurysmal neck and the parent artery

Soumen Kanjilal  1 , Preetham S Dange  2 , Kuntal Kanti Das  1 , Kamlesh Singh Bhaisora  1 , Awadhesh Kumar Jaiswal  1
Affiliations

Giant M1 segment aneurysm: Illustration of the importance of cross-sectional ratio of aneurysmal neck and the parent artery

Soumen Kanjilal et al. Brain Circ. .
No abstract available

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
The preoperative images of the patient; (a) Axial magnetic resonance view showing giant thrombosed aneurysm at the left anterior sylvian fissure (yellow arrow), the hyperintense subarachnoid hemorrhage is present adjacent to the aneurysm (white arrow); (b) Diffusion-weighted imaging sequence showing the thrombosed aneurysm; (c and d) Lateral view of computed tomography angiogram, showing a giant aneurysm from the M1 segment (red arrow), the middle cerebral artery (MCA) bifurcation can be seen distal to the aneurysm (blue arrow); (e) Coronal view and (f) Lateral view of digital subtraction angiography, showing giant thrombosed aneurysm involving the left M1 segment with filling of the distal MCA
Figure 2
Figure 2
Postoperative angiogram, left internal carotid artery (ICA) run (a) Left anterior-oblique view showing two clip artifacts (yellow arrow); (b and c) Lateral angiogram showing no immediate filling of the distal middle cerebral artery (MCA) (blue arrow) and delayed filling of the distal MCA from pial collaterals; (d) Coronal angiographic view, showing filling of distal MCA from pial collaterals (red arrow) and normal filling of the left anterior cerebral artery (ACA); (e) Coronal view after right ICA run, showing normal filling of right MCA and right ACA with no flow across the anterior communicating artery onto left ACA; (f) Coronal view following, left vertebral artery run
Figure 3
Figure 3
(a) The cross-section of the aneurysm (a) along with the parent vessel (p) before clipping. (b) The cross-section of the aneurysm and parent vessel after applying the clip, at first surgery, showing reduction in diameter of the parent vessel. (c) The new configuration of the M1 segment after clip readjustment and leaving the residual neck of aneurysm and maintaining the diameter of the parent vessel
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