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Wk 1, Case 3 - Review

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This was, uh,

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I thought it was a very interesting case and I think everyone really did well on

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this case. This is a pretty, I remember this case 'cause I, I read this out.

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The patient kind of walks in and literally has vision loss.

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And so I remember looking at this case, I'm like, what in the world? But,

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you know,

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this is a really nice example of a large giant aneurysm that's involving

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the, um, the, uh, carotid terminus.

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So you can see on this particular image on the, the right hand side, you know,

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with the leap of faith, you can see what it's doing to the optic chiasm.

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It's actually displacing the optic chiasm infra laterally. Um,

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and here's the part of the cor cavernous portion of the carotid artery,

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another portion of the carotid artery.

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So this is really the supra glenoid portion.

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There's a cavernous segment and you can see how this aneurysm is involving the

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expected location of the supra glenoid carotid artery extending into the carotid

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terminus. Um,

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the one thing that can tell you that this is a pulsating aneurysm is,

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especially when we give contrast,

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you can see the pulsation on the frequency and code encoding direction.

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So, uh, I don't think this happened with this group,

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but sometimes people will say, well, this a partially thrombo aneurysm.

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And really on the T two weighted image, it looks completely a,

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has a lot of flow.

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And then the pulsation artifacts here that you see on the chron images,

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this really tells you that there's a lot of wall motion in this case.

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So this is just a very, um, unusual case of a patient that presented with, um,

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vision loss due to a giant aneurysm.

Report

Patient History
Right visual field disturbances.

Findings
Study demonstrates an approximately 3cm (TRV) x 3cm (CC) x 2.4cm (AP) aneurysm that appears to be arising from the right carotid terminus. The aneurysm is associated with pulsation artifact which is most prominent contrast-enhanced T1 weighted images. The aneurysm is extending into the suprasellar cistern and abutting the optic chiasm. The aneurysm superiorly displaces the subfrontal region and thalamus with mass effect involving the 3rd ventricle. The aneurysm is also abutting and displacing the optic chiasm.

Axial FLAIR and T2-weighted images show marked prominence of the sulci and ventricles. There are multiple focal and confluent areas of increased FLAIR and T2 signal involving the juxtacortical, centrum semiovale and periventricular white matter, which is likely due to microvascular angiopathy. Contrast-enhanced T1-weighted images show no abnormal intra-axial enhancing masses.

Patient has undergone a right frontoparietal craniotomy.

Conclusions
1. 3cm x 3cm x 2.4cm aneurysm that appears to be arising from the right carotid terminus with mass effect on the adjacent brain and optic chiasm, which can be further characterized with MRA of the circle of Willis.
2. Marked prominence of the sulci and ventricles with increased FLAIR and T2 white matter changes likely due to microvascular angiopathy.
3. Remote right frontoparietal craniotomy.

Case Discussion

Faculty

David M Yousem, MD, MBA

Professor of Radiology, Vice Chairman and Associate Dean

Johns Hopkins University

Suresh K Mukherji, MD, FACR, MBA

Clinical Professor, University of Illinois & Rutgers University. Faculty, Michigan State University. Director Head & Neck Radiology, ProScan Imaging

Tags

Neuroradiology

MRI

Head and Neck