Bilateral hypoplastic lateral meniscus.

Among other anomalies of the menisci, a hypoplastic medial meniscus is extremely rare, with only four cases being described in the English literature. We were unable to find a description of this anomaly in the lateral knee compartment. A case report of a young patient with an arthroscopic diagnosis of bilateral hypoplastic lateral menisci is presented. We believe the arthroscopist should be familiar with this rare entity, even though it might be an incidental finding.