Presentation
Locking right knee.
Patient Data
Age: 8 years
Gender: Male
From the case:
Discoid lateral meniscus
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There is an abnormal body width of the lateral meniscus (>20 mm) on coronal sequences, visible in more than three images on sagittal sequences with an intrinsic high STIR (degenerative).
The medial meniscus appears normal.
Case Discussion
MRI features of a discoid lateral meniscus. Discoid menisci are of congenital origin, usually affecting the lateral meniscus, bilateral up to 50%, prone to cystic degeneration with subsequent tear (due to decreased collagen fibers within the discoid meniscus).