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Wk 4, Case 4, Shoulder MR - Review

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So here we have a 69 year old shoulder pain,

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limited range of motion and throwing injury of almost two weeks ago

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with this case. We saw that, uh, you know, this, the tendons, uh,

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are basically, uh, we have a full thickness, uh,

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partial with tear at least of the, uh,

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supraspinatus and in infraspinatus tendon. And the other thing we have, uh,

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some of, some of you may have called like a small broad base, uh, suba.

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These fight.

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What you can see here is this little piece of extra bone that arguably is, uh,

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likely probably causing some, uh, uh, impingement, right? And,

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uh, impingement of the shoulder can be divided in,

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divided into two broad categories. What I want you to remember is, uh,

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internal and external impingement, okay? External impingement things causes,

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or you want to think of those, uh, things that, uh, can, uh,

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compress upon the, uh, part of the corco acromial arch. Okay?

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Um, or this, uh, half ring, if you will, uh,

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that can impinge upon the rotator cuff tendons. Okay? And working from a, uh,

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sort of anterior to posterior fashion, we can, uh,

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think about the corco process. We talked about that narrowing earlier. Okay.

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Other things that can cause narrowing, uh, of the, uh,

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this arch or this area are gonna be osteophytes from, uh, uh,

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inferiorly directed osteophytes from, say, severe, uh,

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acromioclavicular joint osteoporosis, other things that can cause, uh,

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impingement, uh, maybe like a thickened cortical, uh, humeral ligament, right?

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Other things are gonna be, uh, a type three, uh, or, uh,

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uh, or hooked acromion, uh, as we see here, in this case,

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a little bit of lateral downsloping as well in the coronal plane.

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Mind you though, some are, uh, some authors including Dr.

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Gentilly from here at UCSD have, have shown that that has really not proven,

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uh, to pan out these, this lateral downsloping in the, uh,

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in the coronal plane. But, uh, for myself, if, uh, my surgeon is still,

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uh, worried about subacromial decom, uh, subacromial, uh,

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impingement or subcoracoid impingement, along those lines, I will offer, uh,

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a dynamic imaging under ultrasound. And again, I'll look for any bunching of,

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of the, uh, tendon otic, typically tendon or partially torn tendon,

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as well as bunching up of the, uh,

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subacromial subdeltoid bursa or even the subcoracoid bursa. Okay?

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And an abrupt release as the patient is ab ducted and a deducting

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their, uh, um, their shoulder to look for that sort of impingement. But here,

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just a nice case of a full thickness, uh, uh,

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tear of the supraspinatus and infraspinatus tendons,

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particularly centered at the, uh, junctional fibers here.

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And some of you nicely measured. The, uh,

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mentioned that the failure is at and near their footprint with arguably a few

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tendonous fibers still remaining

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Intact at their f plates or footprints.

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And then also accurately measured out this, uh, tendon tearing,

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which is, I don't know, about 22 or 23, uh, millimeters.

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And some of you also went and had and measured this, uh, tendon tear, uh,

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accurately for our surgeons, um, in the, uh,

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AP plane as well. And if I, if I had to, I'd probably measure it like this,

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something like that,

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and provide that information to the surgeon along with any, um,

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uh, muscle atrophy of the supraspinatus or involved muscle, uh, uh,

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muscle bellies of the respective tendons that were torn.

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So that's how I read this case. So basically, um, you know,

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full thickness tears of, of these tendons, as well as, uh, some, uh,

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impingement.

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There's also a little bit of tearing and tendonosis of the subscapular tendon.

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But, uh, arguably, obviously the main finding is gonna be this, uh, tendon tear,

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full thickness of, of the, uh, more superior, uh, tendonous, uh, uh,

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more superior rotator cuff tendons.

Report

Patient History

69-year-old male with right shoulder pain and very limited range of motion after lifting and throwing injury 1-1/2 weeks ago.

Findings

ROTATOR CUFF: Full-depth and near full-length tear of the rotator cable and conjoined tendon involving the entire supraspinatus and the anterior portion of the infraspinatus footprint. The tear measures 4cm in width and 3.5cm in anteroposterior dimension.

SUBACROMIAL/SUBDELTOID BURSA: Mild to moderate diffuse peritendinobursitis.

MUSCLES (ROTATOR CUFF/DELTOID, TRAPEZIUS, PECTORALIS): Interstitial tearing of the infraspinatus myotendinous junction. Grade 3+ fatty infiltration and volumetric atrophy of their corresponding muscle bellies with associated edema.

Mild to moderate tendinosis and interstitial delamination of the superior subscapularis.

Intact teres minor.

BICEPS TENDON: Normal.

AC JOINT: Nominal AC joint arthropathy.

CORACOCLAVICULAR LIGAMENTS: Intact.

SUBACROMIAL ARCH/OUTLET: Type 3/hooked acromion with lateral downsloping.

Mildly thickened coracoacromial ligament.

SUBCORACOID ARCH: Normal.

GLENOHUMERAL JOINT: No arthropathy. Nominal chondrosis. No signs of capsulitis. Normal glenohumeral ligaments.

GLENOID LABRUM: Fraying of the superior labrum without displaced labral tears or paralabral cysts.

BONES: No fracture or dislocations. No intramedullary lesions.

SUBCUTANEOUS SOFT TISSUES: Mild diffuse periarticular soft tissue swelling.

AXILLA: Normal. No space-occupying lesions.

Impressions
1. Narrowing of the lateral subacromial arch due to a type 3/hooked, laterally downsloped acromion and a mildly thickened coracoacromial ligament.

2. A 4cm x 3.5cm full-depth and near full-length tear of the entire supraspinatus and anterior infraspinatus footprints with medial retraction.

3. Interstitial tearing with reactive edema of the infraspinatus myotendinous junction.

4. Mild to moderate diffuse peritendinobursitis.

Case Discussion

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Gitanjali Bajaj, MD

Assistant Professor

University of Arkansas for Medical Sciences

Edward Smitaman, MD

Clinical Associate Professor

University of California San Diego

Brian Y. Chan, MD

Assistant Professor of Musculoskeletal Radiology

University of Utah

Todd D. Greenberg, MD

Radiologist

ProScan

Tags

Shoulder

Musculoskeletal (MSK)

MRI