Bilateral discoid medial menisci: an adult patient with symmetrical radial tears in both knees.

A discoid meniscus is a thick meniscus, discoid in shape rather than having the normal semilunar configuration. Discoid meniscus is considered an uncommon lesion; discoid medial meniscus is rare and involvement of the medial meniscus bilaterally is extremely rare. This is the first case report of bilateral discoid medial menisci with symmetrical radial tears. The patient was treated successfully by excision of the central anomalous discoid portion of the menisci, using arthroscopic techniques.