The menisci and their attachments into bone represent a functional unit. The menisci are able to distribute loads and therefore reduce the stress on the tibia, a function which is regarded as essential for cartilage protection and prevention of osteoarthritis. Lubrication, proprioception and joint stabilization, load transmission are the major functions of the knee meniscus. Lateral meniscus tends to show more developmental variations. Among many types of meniscal anomalies reported, discoid meniscus is the most common entity. The etiology of discoid meniscus has only been partially explained. Here we report a case of unilateral discoid lateral meniscus which was observed in an adult male cadaver.