Presentation
Chronic knee pain.
Patient Data
A triangular-shaped structure is seen at the site of the posterior horn of the lateral meniscus following bone-marrow signal in all pulse sequences with well-corticated edges suggesting a meniscal ossicle. Additionally, there are osteoarthritic changes, anterior cruciate ligament tear, complex tear of the posterior horn of the medial meniscus and synovial effusion.
Case Discussion
Meniscal ossicles are relatively uncommon findings in knee imaging. They usually appear as a well-corticated structure following bone-marrow signal in all pulse sequences on magnetic resonance imaging. Their common site is at the posterior horn and the root of the medial meniscus. Meniscal ossicles are usually associated with meniscal tears, cartilage erosions, and anterior cruciate ligament injuries. Many theories have been postulated regarding the pathology of the meniscal ossicle including congenital, degenerative, and post-traumatic causes.
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