MR Arthrogram Shoulder — Dictation, Appropriateness, and Dose for Residents

1. The Attending-Ready MR Arthrogram Report

It’s a classic MSK case. A young throwing athlete with chronic shoulder pain and a history of instability. The conventional MRI was equivocal — maybe a hint of superior labral signal abnormality, but nothing definitive. Now the orthopedic surgeon has ordered a direct MR arthrogram, and your attending wants a clear, confident read on the labrum, biceps anchor, and capsule. This isn’t just about finding a tear; it’s about mapping the anatomy for a potential surgery. Getting the details right — from the clock-face location of a Bankart lesion to the specific type of SLAP tear — is what separates a good read from a great one. When I was a fellow, this was the kind of study where I double- and triple-checked my findings before showing the attending. Having a solid template is your first line of defense. For more high-yield references like this, check out the free residents and fellows resource hub.

2. What an MR Arthrogram of the Shoulder Covers and What Attendings Look For

A direct MR arthrogram is a two-part study: a fluoroscopy- or ultrasound-guided injection of dilute gadolinium into the glenohumeral joint, followed by a dedicated MRI. The intra-articular contrast distends the joint capsule, forcing fluid into subtle tears and outlining structures that are otherwise compressed and difficult to evaluate. It’s the problem-solver for suspected labral or capsular pathology.

Your attending expects a systematic evaluation that answers these key clinical questions:

• Labral Integrity: Is there a SLAP (superior labrum anterior to posterior) tear? Is there a Bankart lesion (anterior-inferior labrum)? A posterior labral tear?
• Associated Bony Injury: Is there a bony Bankart (glenoid rim fracture) or a Hill-Sachs deformity (posterolateral humeral head impaction fracture)?
• Rotator Cuff: Are there any partial-thickness articular-side rotator cuff tears, which are made more conspicuous by the contrast?
• Capsule and Ligaments: Is there evidence of adhesive capsulitis (frozen shoulder), such as a thickened capsule and obliterated axillary recess?
• Intra-articular Bodies: Are there any loose bodies floating in the joint?

The goal is to provide a comprehensive pre-operative map for the surgeon, detailing the extent and location of all relevant pathology.

3. Radiology Report Template for MR Arthrogram Shoulder (Direct Intra-Articular Contrast)

This template provides a solid starting point for your dictation. Modify it based on your institution’s preferences and the specific findings of your case.

Technique

A direct MR arthrogram of the [right/left] shoulder was performed. Under fluoroscopic guidance, a 22-gauge spinal needle was advanced into the glenohumeral joint. Following confirmation of intra-articular position with a small amount of iodinated contrast, approximately [10-15] mL of dilute gadolinium solution was injected without complication, achieving good capsular distention. The patient was then transferred to the MRI scanner.

Multiplanar, multisequence images of the [right/left] shoulder were obtained, including T1-weighted fat-saturated sequences in the axial, coronal oblique, and sagittal oblique planes, as well as T2-weighted fat-saturated sequences. An ABER (Abduction and External Rotation) sequence was also performed.

Findings

Glenohumeral Joint: The joint is well-distended with contrast material. No significant effusion or loose intra-articular bodies are identified.

Glenoid Labrum:
– Superior Labrum/Biceps Anchor: The biceps-labral complex is [intact/describe tear]. [If abnormal, describe: Contrast extends into the substance of the superior labrum, consistent with a SLAP tear. Specify type if possible, e.g., “Type II SLAP tear with detachment of the biceps anchor.”]
– Anterior Labrum: The anterior labrum is [intact/describe tear]. [If abnormal, describe: A tear of the anterior-inferior labrum is identified from the [3:00 to 6:00] position, consistent with a Bankart lesion.]
– Posterior Labrum: The posterior labrum is [intact/describe tear].
– Inferior Labrum: The inferior labrum is [intact/describe tear].

Rotator Cuff:
– Supraspinatus: The tendon is [intact/describe tear]. [Note any articular-side partial-thickness tears, which will fill with contrast.]
– Infraspinatus: The tendon is [intact/describe tear].
– Teres Minor: The tendon is [intact/describe tear].
– Subscapularis: The tendon is [intact/describe tear].

Bones and Articular Cartilage:
– Humeral Head: [Normal/Note Hill-Sachs deformity, typically posterolateral.]
– Glenoid: [Normal/Note bony Bankart lesion or glenoid bone loss.]
– Articular cartilage appears [preserved/thinned, with findings of osteoarthritis].

Capsule and Ligaments: The glenohumeral ligaments are [unremarkable]. The axillary recess is [well-distended/contracted and thickened, suggestive of adhesive capsulitis].

Acromioclavicular Joint: [Unremarkable/Degenerative changes are present.]

Muscles: The muscles of the rotator cuff are [normal in bulk and signal/show evidence of atrophy or fatty infiltration].

Impression

1. [e.g., Type II SLAP tear involving the biceps anchor.]
2. [e.g., Chronic-appearing Bankart lesion of the anterior-inferior labrum from the 3:00 to 5:00 position.]
3. [e.g., Small posterolateral humeral head impaction fracture, consistent with a Hill-Sachs deformity.]
4. [e.g., No full-thickness rotator cuff tear. Small partial-thickness articular-side tear of the anterior supraspinatus tendon.]

4. Free Template Sources for Your Personal Library

Building a personal library of high-quality templates is one of the best things you can do as a trainee. While you’ll develop your own over time, two great free repositories exist to get you started. These are excellent, non-commercial resources maintained by and for radiologists.

• RadReport.org: Curated by the RSNA, this is a comprehensive library of peer-reviewed templates covering nearly every modality and subspecialty. It’s a go-to for standardized, evidence-based reporting language.
• Radiology Templates (AU): An excellent resource maintained by Australian radiologists. It offers a clean interface and practical, clinically-focused templates that are easy to adapt.

5. The Next-Level Move: From Free-Form Dictation to Structured Report

The template above is a great static tool. But the real bottleneck on call isn’t finding a template; it’s efficiently populating it with your specific findings without getting bogged down. You see the Bankart lesion and the Hill-Sachs deformity. Instead of navigating through a macro and filling in a dozen fields, you could just dictate the positive findings: “Anterior-inferior labral tear from 3 to 6 o’clock. Posterolateral humeral head impaction fracture.”

This is where AI-powered tools come in. GigHz Precision AI is designed to streamline this exact workflow. You dictate your findings in natural language, and the AI engine structures them into a complete, attending-ready report based on pre-loaded ACR and SIR templates. It helps ensure all the key elements are present and correctly formatted, letting you focus on the images, not the clicks.

6. When Should You Order an MR Arthrogram of the Shoulder? ACR Appropriateness Criteria

The decision to proceed with an invasive study like an MR arthrogram hinges on whether the clinical question can be answered with non-invasive imaging. The American College of Radiology (ACR) provides evidence-based guidelines to help with this decision.

For the evaluation of Chronic Shoulder Pain, the ACR notes that a direct MR arthrogram is Usually Appropriate for specific clinical scenarios, particularly suspected labral tears or in the evaluation of shoulder instability. It is often the next step when a conventional, non-contrast MRI is non-diagnostic but clinical suspicion for an internal derangement remains high.

Key alternatives to consider include:

• Conventional MRI of the shoulder: This is the first-line advanced imaging modality and is often sufficient for diagnosing full-thickness rotator cuff tears, bony pathology, and significant muscle atrophy.
• CT arthrogram of the shoulder: This may be appropriate when MRI is contraindicated (e.g., due to an incompatible implanted device). It provides excellent detail of the labrum and associated bony injuries like a bony Bankart lesion.

Ultimately, the choice depends on balancing the need for diagnostic detail against the minimally invasive nature of the arthrogram procedure.

7. How Much Radiation Does an MR Arthrogram of the Shoulder Deliver?

One of the main advantages of MRI is the absence of ionizing radiation. However, a direct MR arthrogram involves a fluoroscopy-guided injection to place the contrast in the joint. This fluoroscopy component does deliver a small radiation dose.

The estimated effective dose from the fluoroscopic injection portion of the procedure is very low, typically in the range of 0.05 to 0.2 mSv. To put this in perspective, this is a fraction of the average annual background radiation exposure in the United States (~3 mSv) and is considered a very low-dose procedure. The subsequent MRI scan involves no radiation at all.

8. MR Arthrogram Shoulder Imaging Protocol — Sequences, Contrast, and Key Parameters

A successful MR arthrogram relies on a two-stage process: a precise intra-articular injection followed by a tailored MRI protocol. The key is using T1-weighted fat-saturated sequences, which make the bright gadolinium contrast pop against the dark, suppressed background fat, clearly outlining the intra-articular structures.

The contrast mixture is a dilute solution designed for joint distention and optimal signal. A common recipe is 0.1 mL of gadolinium mixed with saline, iodinated contrast (for fluoroscopic visualization), and a small amount of lidocaine for patient comfort, totaling 10-15 mL.

The following table outlines a typical sequence stack. The ABER (Abduction and External Rotation) position is critical, as it tensions the anterior-inferior capsule and labrum, making Bankart lesions and partial articular-side cuff tears more conspicuous.

Common protocol pitfalls: A key pitfall is under-distention of the joint capsule. Injecting less than 10 mL may not provide enough pressure to force contrast into small tears, potentially leading to a false-negative study. Another is delaying the scan; imaging should be completed within 30-60 minutes of injection before the contrast is significantly reabsorbed.

9. The 3-Months-Free Offer for Radiology Residents and Fellows

3+ months free for radiology residents and fellows

Look like a rockstar on your reports — dictate positive findings in free form, and the AI generates a structured report using ACR + SIR templates with the appropriate clinical decision support firing automatically. All we ask in return is your feedback so we can keep improving the product for trainees.

Signup is simple. No credit card, no long forms. To apply, just provide these three items:

1. Your PGY year (e.g., PGY-2, PGY-4)
2. Your training type (radiology residency or specific fellowship — IR, body, MSK, neuro, peds, breast, nucs)
3. Your training program / hospital name

We’ll get you set up right away. Ready to give it a try? You can apply for the residents free-access program here.

10. Frequently Asked Questions

Is GigHz Precision AI HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. It operates on the anonymized text of your dictation and does not require access to protected health information (PHI) or your hospital’s EMR or PACS.

Does this require a complex IT setup?

No. It’s a browser-based tool that works on any modern computer, including the call-room PC or your personal laptop or iPad. There is no software to install and no need to involve your hospital’s IT department.

How does this work with PowerScribe or other dictation systems?

It works alongside your existing dictation system. You can dictate your findings as you normally would, then use the structured output from GigHz Precision AI to finalize your report in your PACS/RIS. Many residents use it on a second monitor or an iPad to quickly generate the structured impression and findings sections.

Can I use this on my phone or iPad?

Yes, the platform is fully responsive and works well on tablets like the iPad, which is perfect for use in the reading room. While it functions on a phone, the larger screen of a tablet or computer is recommended for the best experience.

Can I customize the templates?

Yes. While the system comes pre-loaded with ACR and other society-based templates, you can create, modify, and save your own templates to match your personal style or your institution’s specific requirements.

What happens after my residency or fellowship ends?

The free access program is specifically for trainees. After you graduate, you can transition to a standard attending plan. Your customized templates and settings will all be saved and ready for you in practice.