Parrot beak meniscal tear
Known osteoarthritis of the knee. Acute pain and effusion after minor trauma.
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MRI shows a tear in the mid-portion of the medial menicus with inferior displacement of a fragment between the capsule (menisco-tibial ligament) and the tibia. Preexisting high-grade chondropathy in the medial femoro-tibial and retropatellar compartments of the joint.
The form of this meniscal tear on transverse sections ressembles the upper beak of a parrot when viewed from the side.