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Joseph Junewick, MD FACR
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Discoid Meniscus

Case Detail

Anatomy: Musculoskeletal
Junewick
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 8 years ago
Updated: over 8 years ago
Tags: PEDS
Modality/Study Types: MR
Activities:
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History

8 year old female with knee pain and chronic snapping and popping


Case Images


Diagnosis

Discoid lateral meniscus.

Findings

MR – Sagittal and axial T1 and T2 images of the right knee demonstrate marked enlargement of the posterior horn of the lateral meniscus with heterogeneous signal and lack of central tapering.

Discussion

The etiology of discoid meniscus is not known. It is theorized that there is congenital deficiency or tear of the posterior attachment of the lateral meniscus to the lateral tibial plateau. Consequently, the only posterior fixation is the meniscofemoral ligament which pulls the meniscus into the intercondylar notch during extension. The irritation and inflammation from constant mediolateral motion causes thickening of the meniscus.

Discoid meniscus is more common in males and almost exclusively lateral. Often discoid meniscus is asymptomatic but can present with pain, locking, effusion, restricted range of motion, and/or instability.

Reference

Ozonoff MB. Pediatric Orthopedic Radiology. WB Saunders. 1991.

Silverman JM, Mink JH, Deutsch AL. Discoid Menisci of the Knee: MRI Appearance. Radiology (1989); 173:351-354.



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