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Large appearing anterior horn of the lateral meniscus, secondary to a displaced posterior horn which has flipped into the intercondylar notch, with the body flipped directly posterior to a truncated anterior horn. There is a resultant 'ghost meniscus sign' posteriorly in the expected location of the posterior horn. A double delta sign is seen anteriorly on the sagittal images .
Mild joint effusion.
Lateral meniscus bucket handle tear (flipped meniscus).
A flipped meniscus is a sub-type of bucket handle tear where a large portion of meniscus flips to lie adjacent to the anterior horn leaving an empty space at the donor site. It implies either meniscocapsular / meniscopopliteal fascicle detachment or peripheral vertical longitudinal complete tear as was the case here.