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Meniscal and Shape Deformation in Discoid Lateral Meniscus:
- Meniscal Deformation: Indicates peripheral detachment through abnormal infolding, buckling, and shifting.
- Shape Deformation: Signals early instability with surface changes, meniscal shifts, and development of meniscal megahorns. Important imaging signs include:
Additional Key Features:
- Chicken Drumstick Appearance:
On MRI, the meniscus may bulge at the free edge and flatten elsewhere, resembling a chicken drumstick in the coronal plane, often with an increased intrameniscal signal. - Pseudo–Bucket-Handle Tear:
Refers to a centrally flipped discoid meniscus (DM) or middle segment into the intercondylar recess without a longitudinal tear, indicating underlying hypermobility and peripheral rim instability. - Posterior Megahorn:
Results from progressive anterior capsular detachment leading to instability. Conversely, an anterior megahorn indicates a Wrisberg-type DM with absent posterior attachments.
Restrepo R, Weisberg MD, Pevsner R, Swirsky S, Lee EY. Discoid Meniscus in the Pediatric Population:: Emphasis on MR Imaging Signs of Instability. Magn Reson Imaging Clin N Am. 2019 May;27(2):323-339
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
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#VisualizingMSK #Lateralmeniscus #Discoidmeniscus #Meniscaltears #Wrisbergmeniscus #Meniscalinstability
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| (Fig 1-C.06) Ring-shaped meniscus versus bucket handle tear (0) | 2024.02.08 |
| (Fig 1-C.05) Type III Wrisberg-type discoid meniscus (0) | 2024.02.08 |
| (Fig 1-C.04) Type II Incomplete discoid meniscus (0) | 2024.02.08 |