MR Imaging of Meniscal Cysts: Incidence, Location, and Clinical Significance

• Published in: American journal of roentgenology (1976) Vol. 177; no. 2; pp. 409 - 413
• Main Authors: Campbell, Scot E, Sanders, Timothy G, Morrison, William B
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Leesburg, VA Am Roentgen Ray Soc 01.08.2001; American Roentgen Ray Society
• Subjects: Adult; Biological and medical sciences; Cysts - diagnosis; Cysts - epidemiology; Diseases of the osteoarticular system; Female; Humans; Incidence; Investigative techniques, diagnostic techniques (general aspects); Magnetic Resonance Imaging; Male; Medical sciences; Menisci, Tibial - pathology; Miscellaneous. Osteoarticular involvement in other diseases; Osteoarticular system. Muscles; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Retrospective Studies; Tibial Meniscus Injuries; United States; North America; America; Human; Knee; Radiodiagnosis; Diseases of the osteoarticular system; Epidemiology; Nuclear magnetic resonance imaging; Incidence; Knee disease; Cyst; Medical imagery; Adult; Benign neoplasm; Diagnosis; Semilunar cartilage; Localization; Public health
• ISSN: 0361-803X; 1546-3141
• DOI: 10.2214/ajr.177.2.1770409

The purpose of this study was to determine the incidence of medial versus lateral meniscal cysts as seen on MR imaging. A total of 2572 knee MR imaging reports were retrospectively reviewed for the presence of meniscal tears and cysts. Two musculoskeletal radiologists reviewed all images with reported cysts. The type and location of meniscal tear and the presence and location of meniscal cysts were recorded. A total of 1402 meniscal tears were reported in 2572 MR examinations (922 [66%] of 1402 in the medial compartment; 480 [34%] of 1402 in the lateral compartment). Meniscal cysts were present in 109 (4%) of 2572 knees. Of the 109 cysts, 72 (66%) were in the medial compartment, and 37 (34%) were in the lateral compartment. Meniscal cysts were found in association with 72 (7.8%) of the 922 medial meniscal tears and 37 (7.7%) of the 480 lateral meniscal tears. Meniscal cysts showed direct contact with an adjacent meniscal tear in 107 (98%) of 109 cases, with the tear showing a horizontal component in 96 (90%) of 107 cases. Meniscal cysts occur almost twice as often in the medial compartment as in the lateral compartment. Medial and lateral tears occur with the same frequency. These findings, when viewed in the context of the historical literature on meniscal cysts, suggest that MR imaging detects a greater number of medial meniscal cysts than physical examination or arthroscopy, and that MR imaging can have an important impact on surgical treatment of patients.