On MRI Rotator cuff delaminating tears can result in Musculotendinous Junction Cysts.
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These Musculotendinous junction cysts are seen in the rotator cuff tendons, mostly in Supraspinatus and less commonly in infraspinatus.
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In this post we look at the appearance of both Delaminating Rotator cuff tears and Musculotendinous junction cysts.
- MTJ cysts area result of an underlying articular surface delaminating tear.
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- The tear extends through the tendon and when it gets to the MTJ, is arrested.
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- Fluid keeps accumulating in the tear which wells up at the MTJ to form a cyst.
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Centered at the MTJ, but if large can extend into the tendon and muscle.
- Can be single or multiple cysts (Pink arrows).
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- Usually not septated and no enhancement.
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- May see connecting delaminating tear (Blue arrows).
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Here is what to look for when assessing MTJ cysts:
- Location (which tendon) of cyst/s.
- Size of cyst/s.
- A delaminating tear extending to the cyst.
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