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Case: Pilocytic Astrocytoma

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Here's an individual with a right cerebellar mass.

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It's a mixed cell in the cystic lesion, in the medial aspect

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of the right cerebellar hemisphere on flare,

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there's, um, near complete suppression of fluid signal

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with an cystic component.

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Now notice this is the first time of use flare.

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Um, flare is a great sequence.

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We acquire it in all our studies,

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but for a lot of brain tumors, I trust the T two

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and the other sequences more layer is,

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provides supplemental information here.

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It tells, tells us about the fluid in here, that it's

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probably pro nastious fluid, but

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otherwise, um, not overly complicated.

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There's enhancement of this medial solid component

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of this mass, but no enhancement of the cystic component.

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No mural enhancement.

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No mural nodularity be, um, along that periphery.

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And there's facilitated diffusion in this solid component.

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The diffusivity is 1850

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and it goes without saying this facilitated diffusion in

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this fluid filled cystic component.

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Uh, 27, 20, uh, 25. So just very free movement of water.

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So, um,

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there's a hypodense appearance of the solid component on CT

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and a near CSF density of the cystic component, which goes

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with, you know, what we're suspecting based on the flare

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of probably some slightly proac fluid.

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And this is a polycystic astrocytoma.

Report

Faculty

Asim F Choudhri, MD

Chief, Pediatric Neuroradiology

Le Bonheur Children's Hospital

Tags

Oncologic Imaging

Neuroradiology

Neoplastic

MRI

Brain