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Popliteal Artery Aneurysm

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0:00

You also want to look for a popliteal artery aneurysm.

0:04

These are generally gonna be seen in your older patients.

0:07

The criteria for aneurysm, there are two

0:11

that are widely used.

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One is a caliber more than two centimeters,

0:16

and then the other is caliber change

0:18

where the vessel dilates so that it is

0:22

150% of the diameter of the more proximal uh, artery.

0:27

So this is a very large aneurysm in this particular patient.

0:32

And again, these tend to be in your older

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patient population.

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Many of them have an abdominal aortic, uh, aneurysm.

0:39

And just be aware that if you see one on one side

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that a significant number of them are bilateral

0:46

and the patient should probably have screening done.

0:49

Uh, for both the knees here we see, uh, an aneurysm in a,

0:54

in a specimen and in a patient notice the signal

0:59

is dark.

1:00

This is located a bit lateral to the midline.

1:03

Your baker cyst would be, would be medial.

1:06

It doesn't have a neck

1:07

and it's intimate, uh, with the vessels.

1:09

Then you can look for pulsation uh, artifacts.

1:13

Uh, for, for this though, I'll tell you,

1:16

they're often absent because many of these are thrombose

1:20

and so there isn't any pulsation available in this case,

1:24

it's not thrombose, it was still perfused.

1:27

Here's the CTA showing this large aneurysm,

1:30

and we can see the pulsation.

1:33

Again, it's gonna go in your phase and code direction.

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So, uh, we usually like to, um, specify the phase

1:40

and code not go anterior to posterior

1:43

because it obscures the, the cruciate.

1:46

Uh, so this is, you know, typical phase

1:48

and code directions that we have on our, uh, examinations,

1:53

but it can be absent, right?

1:56

So don't look for that.

1:57

If you don't see ghosting,

1:58

that does not exclude the diagnosis of an aneurysm.

Report

Faculty

Donald Resnick, MD

Professor Emeritus, Department of Radiology

University of California, San Diego

Mini N. Pathria, MD, FRCP(C)

Division Chief, Musculoskeletal Imaging

University of California San Diego

Eric Y. Chang, MD

Adjunct Professor, Radiology

University of California, San Diego

Brady K. Huang, MD

Clinical Professor of Radiology

UC San Diego Medical Center

Tags

Musculoskeletal (MSK)

MRI

Knee