Purpose: To characterize MR findings of meniscal cysts of the knee. Materials and Methods: We retrospectivelyreviewed knee MR images of surgically confirmed eighteen meniscal cysts. The location and shape of meniscal cystswere evaluated. Results: Six of 18 cases were medial meniscal cysts and 12 of 18 cases were lateral meniscalcysts. Horizental tears were present in all cases(100%). Four of 18 cases had rounded cysts and 14 of 18 cases hadelongated cysts. In 3 of 6 medial meniscal cysts, cysts had dissected into the soft tissues distant from themeniscus, and connecting stalks were visualized. Three of 6 medial meniscal cysts were located adjacent to ameniscal tear. All of the lateral meniscal cysts occured immediately adjacent to the meniscal tear. Conclusion:Meniscal cysts are associated with horizental meniscal tear. The shape of meniscal cysts tend to be elongatedrather than rounded. Medial meniscal cysts occured distant from or adjacent to the meniscal tear according tolocation of the tear. Lateral meniscal cysts occured adjacent to the meniscal tear