What is a discoid meniscus, and what is its significance?
Discoid meniscus is a common variant with morphologic enlargement of the meniscus. Patients usually present with clicking or locking of the knee. As acquired sagittal images can be variable in thickness from scan to scan, this diagnosis can best be made on coronal images. On a coronal MR image through the middle of the femoral condyle, a meniscus that extends centrally beyond the midpoint of the femoral condyle represents a discoid meniscus. The lateral meniscus is more commonly affected, and discoid menisci occur bilaterally in up to 25%.
