Semimembranosus injury - distal (knee MRI)
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Small knee joint effusion. No acute meniscal or ligamentous injury. No cartilage lesion.
Peripheral myofascial/muscle belly edema of the distal semimembranosus with extension into the free tendon. Posteromedial corner structures are otherwise uninjured.
Always keep an eye on the extra-articular structures as a cause for knee pain, especially as these tend to be incompletely imaged when the field of view is centered on the knee.