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Wk 2, Case 2 - Review

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This was a 36 year old who presented with fever.

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So here was the lesion again.

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And in this case, once again,

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we wanna do our localization.

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And what we see is that it's, again,

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close to the sublingual glandular tissue.

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It's more medial to that, so still in the floor of the mouth. But,

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um, it looks almost embedded in the, uh, tongue.

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And it has a rim of enhancement with a lower density center.

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We do have some lymph nodes that are present that are, um,

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not particularly enlarged.

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And when you have a 36 year old with a fever,

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we're going to shift from a neoplastic etiology to more of a,

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um, inflammatory infectious etiology. So, um,

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the other thing to remark upon is the impact it has on the, uh,

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ve. The VE is the airspace in front of the epiglottis,

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and we see that the left side is impinged upon. Um,

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we see that there is some, uh,

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edema here at the base of the tongue in the, um,

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prepo area, and, um,

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a little bit of effacement at the level of the palatine tonsils.

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So, um, this, uh,

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lesion should be in the inflammatory category.

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Given that it has a little bit of a rim of enhancement,

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we're more likely to suggest that it represents an abscess.

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And at that point we want to think about what are the

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potential complications of an infection in this location.

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So there's two basic

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L words that you have to know with regard to,

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um, infections in this location.

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One of them is, l is lemire syndrome,

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which is a complication of pharyngitis,

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and it's also known as post anginal sepsis,

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which could be from a pharyngitis or tonsillitis that

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progresses to sepsis,

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and it may lead to thrombo phlebitis of the jugular

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vein. So when you have infections in this location,

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you do want to consider the carotid chief structures to

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see whether there's thrombo or arteritis that may occur with

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pharyngitis and tonsillitis. So here's an example of one that's in the tonsil,

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and here you can see the patient's had septic emboli into the lung,

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which is one of the complications. Here's the jugular vein,

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normal jugular vein, jugular vein with some thrombus.

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And here's another example, carotid artery,

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jugular vein with thrombus with thrombo phlebitis and septic emboli.

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So that's Lemire syndrome. The other is

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Ludwig Angelo.

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So Ludwig angina usually is from a odontogenic infection that

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affects the oral cavity or the oropharynx.

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It's a inflammation of the sublingual and submandibular spaces.

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So we're close there and it leads to cellulitis

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soft tissues of the floor, of the mouth and neck. What the problem is,

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is that it can lead to obstruction of the airway,

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which is why I pointed out at the level of the molecular that you have some

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narrowing there. Let's look at these images. Here's the dental infection,

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here's the surgical change.

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Here's our CT sagal reconstruction showing at the level

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of the oropharynx, no airway. Here's the trachea. And, um,

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the airway being narrowed.

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So important point on the inflammatory cases is look at the

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caral sheath, look for thrombo fabi, look at the lungs,

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see whether their septic emboli look at the impact on the, um,

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on the airway. So

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we go back to our

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images here and we scroll.

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Certainly the SGL larynx looks fine.

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We have some degree of narrowing of the airway, but,

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and I would probably describe it in the cross-sectional,

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what this diameter is.

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So for the airway, do we need to measure the diameter?

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So, you know, one person's minimal is another person's moderate,

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is another person's severe. So I'm a measurer. So yeah,

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so I would give the measurement. It's the same thing with, uh, for example,

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when you have a big goiter that's narrowing the trachea. Um,

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while there are certain parameters that the clinicians look for that are

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measured, um, I like providing that.

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So that way if I say five millimeters is moderate,

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but the e n d guy says five millimeters, that's good.

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That's only mild narrowing. Um, it's subjective.

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Whereas if we give objective information, I think it's helpful. So yes,

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in this case I would measure the width of that transverse,

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uh,

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width of that airway at the level of the palatine tonsils and give it to them.

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Okay. And they'll do, they'll,

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they'll look clinically or they'll see whether if the patient's gasping for

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breath, breath and short of breath and coughing, you know, then it,

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it's a difference between, um, someone who's not, uh, you know,

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pulling to breathe. Yeah.

Report

Patient History
36-year-old male presents with fever.

Findings
Contrast-enhanced CT was performed from the skull base to the thoracic inlet. There is an approximately 3cm x 2cm rim enhancing mass located in the left floor of mouth. The mass is medial to the left hyoglossus muscle and extends to midline. The posterior aspect of the mass effaces the left lateral aspect of the tongue base. The inferior aspect of the mass is superior to the mylohyoid muscle. The superior aspect of the mass is below the mucosal surface of the floor mouth. There is relative preservation of the fat planes. There is no evidence of obstructive sialadenitis involving the left submandibular gland.

There is an ill-defined oval enhancing mass that is anterolateral to the ring-enhancing lesion that measures approximately 1.3cm x 1cm. This may represent a focal area of sialadenitis versus enlarged sublingual space lymph node.

There is prominence of the adenoidal tissue involving the nasopharynx and tonsil which can be normal for this age.

Imaging of the neck demonstrates no evidence of enlarged lymph nodes given standard accepted size criteria.

Incidental note is made of an approximately 9mm cyst involving the posterior soft tissues of the neck which is likely due to a sebaceous cyst.

The visualized portion of the brain is grossly within normal limits. However, dedicated brain imaging is necessary for complete diagnostic evaluation.

Visualized portion of the lungs is affected by motion artifact and dedicated chest CT is necessary for complete diagnostic evaluation.

Conclusions
1. Approximately 3cm x 2cm ring-enhancing mass involving the left floor of the mouth that would be most consistent with abscess in a patient with fever. This could also represent an infected epidermoid.

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

Head and Neck

CT