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The MRI gives a density signal for soft tissues that helps identify damage or injuries. The surgeon is able to locate individual tendons and look for tears in the rotator cuff.
The rotator cuff is a group of four muscles and their tendons surrounding the shoulder joint. They form an envelope of support and provide stability for the free-moving shoulder.
A normal, healthy tendon produces no signal on an MRI. When a tendon is partially torn, the scan shows a high signal intensity at the site of the lesion. If the tendon is completely torn, the image shows a bright fluid through the entire thickness of the tendon.
In general, MRI has a high sensitivity for finding rotator cuff tears. Other shoulder problems may not be as clear or as easy to see on an MRI.
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