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Arachnoid Cyst

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So, this will be our first case.

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And this is a lesion that's involving

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the left cerebellar pontine angle.

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So, let's take a look at why this patient

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presented. So, in the last series about technique.

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The point that I want to make is this.

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Here's our cochlear, here's our vestibule,

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here's our internal auditory canal.

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And we can actually see the small little nerves

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right here in the internal auditory canal.

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So, we can see these lesions.

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It's extending this little nerve,

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extending laterally,

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and all of a sudden it runs into this large

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mass that's located in the left CP angle.

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So, on the non-contrast T1-weighted images,

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we can see that it's low T1 signal,

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it's high signal on the T2,

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demonstrating that it's cystic.

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And on the FLAIR sequences, we can see there's

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complete suppression of the signal.

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Now, when we do give contrast,

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which is not shown on this specific image,

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there is no enhancement whatsoever.

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So, our differential diagnosis on this is either

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going to be an arachnoid cyst or an epidermoid.

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And in this particular case,

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this is a classic example of an arachnoid cyst.

1:03

On a non-contrast T1, T2,

1:06

and FLAIR sequences. In subsequent vignettes,

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we will now demonstrate the importance of other

1:14

sequences and how we can separate this

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arachnoid cyst from epidermoids.

Report

Faculty

Suresh K Mukherji, MD, FACR, MBA

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

Tags

Temporal bone

Skull Base

Non-infectious Inflammatory

Neuroradiology

Neuro

MRI

Idiopathic

Head and Neck

Brain

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