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FDG Case: Pleurodesis

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Another pitfall that you may encounter is plod desis,

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and I'm showing you the same patient

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in two different time points.

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Um, and we're gonna go through the findings.

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Why is important to appropriately detected this, uh, is

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because, um, as you can see,

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it's very obvious when we look at the nip images,

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it's very obvious where the abnormality is.

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If we look at the first pit, which is at the bottom row,

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see that there's multiple areas of very intense

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tracer uptake along the chest wall.

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And here on the axials we see that it's along the pleura,

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it's peripherally, it's bilaterally.

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So one of the differential diagnosis

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for these findings would be mesothelioma.

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But when we look at this case more in detail, we will see

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that in the areas of uptake, there's actually,

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if we look at the CT portion, there's hyperdense material.

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So this is not, remember we're, at least in the majority

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of the cases, we don't give contrast.

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That would be something to check if you've given contrast.

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But in the absence of contrast, uh,

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hyperdensity along the pleura could be two things.

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One would be either calcification

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from pleural calcified plaques in the context of, uh,

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asbestos exposure or pleurodesis, which is

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a medical procedure in which we create, uh,

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chemical inflammation to adhere the pleural lining

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and prevent pleural effusions.

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What these results is chronic inflammation,

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like in this case, chronic inflammation that

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is persistent over time.

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We see it in subsequent studies.

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The degree of uptake may vary a little bit

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between the studies, but it tends to be consistent

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if we compare both on the top and on the bottom.

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Done, uh, many months, uh, apart, we can see

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that the distribution is unchanged,

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the intensity is unchanged,

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and it all localizes to areas of hyper density.

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The OMA would look different, would not be hyperdense,

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it would be, uh, soft tissue

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thickening in nodules along the pleura.

Report

Faculty

Elisa Franquet Elia, MD

Assistant Professor of Radiology

UMass Chan Medical School

Tags

Response and assessment

PET/CT FDG

PET

Oncologic Imaging

Nuclear Medicine

Iatrogenic

General Oncologic Imaging Concepts