Lateral discoid meniscus
MRI was originally performed for medial knee pain.
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Discoid lateral meniscus.
Horizontal high T2 intrasubstance signal at the posterior horn of medial meniscus not reaching the articular surface, reflecting grade II meniscal degeneration.
In this case, meniscal degeneration was more advanced in the medial posterior horn than in the rather incidentally found lateral discoid meniscus.