Read a Shoulder MRI, Arthrogram, or Radiograph Set in Your Browser

What Actually Arrives on a Shoulder Export

A shoulder CD or download typically contains a DICOMDIR index plus folders of single-frame objects rather than one video-like file. MRI shows up as three or more stacks — oblique coronal along the supraspinatus, oblique sagittal through the rotator-cuff outlet, and a straight axial run through the glenohumeral joint. If the order included an arthrogram, expect two separate studies with different accession numbers: one holding the fluoroscopic injection images from contrast placement, the other the post-contrast fat-saturated MRI taken afterward. Plain radiographs travel as their own single-frame objects too — a true AP, a scapular Y, and an axillary view each live independently rather than sharing one series. Because none of these objects are bundled into a single playable file the way a video export from an ultrasound sometimes is, the folder can look intimidating at first glance: dozens or hundreds of individual files with cryptic names, no obvious grouping, and no thumbnail to preview. That structure is normal for shoulder exports and is exactly what a DICOM-aware reader is built to sort through automatically rather than something gone wrong with the disc.

What the Header Tells You Before You Even Scroll

Every object carries metadata worth reading before the pixels. Series Description names the sequence, Image Orientation (Patient) records the direction cosines that define how far off-axis an oblique stack was angled, and Slice Thickness tells you whether a series is thin enough for reconstruction. Laterality confirms left shoulder versus right, which matters when a disc bundles a comparison study. Study Date separates a fresh injury from an old follow-up, contrast-agent tags mark the post-injection arthrogram series specifically, and the window center and width the reporting radiologist saved often hint at how they wanted the cuff fibers displayed. None of this requires opening a single image — a reader that surfaces these tags up front lets you confirm you're looking at the correct joint, the correct side, and the correct visit before you spend time scrolling through hundreds of frames, which matters most when a patient is carrying discs from more than one hospital visit at once.

Telling Oblique Coronal from Oblique Sagittal by Name Alone

Series descriptions are rarely written out in full — expect abbreviations like “OBL COR PD FS” or “OBL SAG T2” rather than plain English. A coronal-oblique series is angled parallel to the supraspinatus tendon and shows the cuff running roughly left to right across the frame; a sagittal-oblique series is angled perpendicular to that same tendon and shows the cuff footprint end-on, stacked like slices of bread. When the abbreviation is ambiguous, the Image Orientation (Patient) values settle it — the direction cosines describe exactly which plane the scanner tilted toward, independent of what the technologist typed into the description field. Fat-saturation flags matter too: a coronal series without fat saturation reads brighter overall and is usually the anatomic reference, while the fat-saturated counterpart suppresses background signal so that fluid around a torn tendon or a labral lesion stands out more clearly against darker surrounding tissue.

Shoulder Conditions Explained from DICOM

How It Works

What the Reader Does with Your Shoulder Files Locally

Once you drop a shoulder folder in, the reader parses each object's header, groups files into series by Series Instance UID, and sorts each stack by slice position rather than filename. From there you can scroll the oblique coronal and oblique sagittal runs side by side, retune windowing between the fat-saturated arthrogram series and the plain T1 series, and drop a ruler across a cuff tear or a joint gap to get a measurement in millimeters. If you have an arthrogram, the injection images and the post-contrast MRI open as separate tabs you can flip between rather than one merged timeline. When a series has enough contiguous, evenly spaced slices — usually the axial MRI run or a CT if one was ordered — the reader can also build a multiplanar reconstruction, letting you look at the same anatomy from a plane the scanner never actually acquired.

Why the Disc's Own Viewer Won't Open on Your Laptop

Hospitals usually burn a small bundled viewer application onto the same disc as the image files, and that viewer is almost always a Windows executable — it will refuse to launch on a Mac, a Chromebook, or a locked-down work laptop. The DICOM objects themselves are not tied to that program at all; the pixel data, the orientation vectors, and every tag described above are a vendor-neutral format that any compliant reader can open. Skip the bundled .exe entirely and point a browser-based reader at the DICOM folder or DICOMDIR directly. The same portability applies across studies and hospitals — a shoulder MRI acquired on one scanner and an arthrogram acquired on another both use the identical tag structure, so a reader built to interpret the standard doesn't need a separate mode per manufacturer or per hospital's disc-burning software.

Confirm Laterality and Date Before You Read Anything Into It

Before drawing any conclusion from a shoulder series, check the Laterality tag and the Study Date against what you expect. A disc handed over years after an old injury can still contain a prior comparison study alongside the current one, and an unlabeled stack that looks like “the shoulder” may in fact be the opposite side kept for comparison. Cross-check laterality and date against the visit you think you're looking at before treating anything on screen as current.

AI Explanation Is Not a Substitute for Your Radiologist's Read

AI support here can describe what the rendered oblique and arthrogram frames show and translate report language into plain wording, but it does not replace a licensed radiologist's interpretation. Use it to prepare sharper questions before a follow-up visit — particularly when a report mentions a supraspinatus tear, a labral lesion on the arthrogram, or AC joint separation.

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