Presentation
Left knee pain, locking and clicking.
Patient Data
Age: 5 years
Gender: Female
From the case:
Discoid meniscus - with intrasubstance degeneration
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Lateral meniscus:
thick, discoid ( its body is seen in more than three consecutive images on the sagittal plane)
normal peripheral attachments with intact posterior meniscofemoral ligament (stable form)
>80% coverage of the tibial plateau (complete form)
intrasubstance horizontal high signal along the lateral meniscus not reaching the articular surface, in keeping with grade II meniscal degeneration
mild joint effusion
Case Discussion
Discoid meniscus is far more common in the lateral meniscus than in the medial meniscus.
Due to its disorganized, decreased collagen network and lack of vascularization, discoid meniscus is prone to mucinous degeneration and tears even in the absence of trauma.
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