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Discoid menisci in children: MR features
J E Stark1, M J Siegel, E Weinberger
1Mallinckrodt Institute of Radiology, St. Louis, MO 63110-1076, USA.
Discoid meniscus in children typically appears on MRI as a thickened meniscus with a slab shape and increased internal signal. This finding is crucial for diagnosing painful knees in pediatric patients.
Area of Science:
- Pediatric Orthopedics
- Radiology
- Medical Imaging
Background:
- Discoid meniscus is a congenital anomaly.
- It is more common in the lateral compartment.
- Symptomatic discoid meniscus can cause knee pain in children.
Purpose of the Study:
- To define the magnetic resonance (MR) imaging appearance of discoid meniscus in children.
- To compare pediatric findings with adult standards.
Main Methods:
- Retrospective review of 27 discoid lateral menisci in 22 children (age 5-17).
- Evaluation of meniscal shape, signal intensity, and surrounding structures on MRI.
- Clinical or surgical follow-up data analyzed for 16 patients.
Main Results:
- Menisci classified as slab (20) or wedge (7) type.
- Increased intrameniscal signal observed in 23 of 27 menisci.
- Tears were found in 7 of 9 surgically evaluated patients with intrameniscal signal.
Conclusions:
- Symptomatic discoid meniscus in children characteristically shows a diffusely thick meniscus on MRI.
- A slab configuration and diffusely increased intrameniscal signal are key features.
- Intrameniscal signal may or may not extend to the joint surface.
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