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Abnormal Superior Popliteomeniscal Fascicle and Posterior Pericapsular Edema

Indirect MR Imaging Signs of a Lateral Meniscal Tear

Arthur A. De Smet1, David A. Asinger1 and Richard L. Johnson1,2

1 Department of Radiology, University of Wisconsin Hospital and Clinics, E3/311 CSC, 600 Highland Ave., Madison, WI 53792.
2 Present address: Erskine Diagnostic Center, 1948 First Ave., Cedar Rapids, IA 52402.



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  		Fig. 1A. —16-year-old girl with flap tear of posterior horn of lateral meniscus. Sagittal spin-echo proton density-weighted MR image shows displaced flap tear (arrow) of posterior horn.

 


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  		Fig. 1B. —16-year-old girl with flap tear of posterior horn of lateral meniscus. Sagittal spin-echo T2-weighted MR image at same level as A shows edema (arrow) posterior to capsule.

 


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  		Fig. 1C. —16-year-old girl with flap tear of posterior horn of lateral meniscus. Sagittal spin-echo T2-weighted MR image lateral to A and B shows intact superior popliteomeniscal fascicle (arrow) and edema posterior to capsule.

 


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  		Fig. 2. —27-year-old man with complex tear of posterior horn of lateral meniscus. Sagittal spin-echo T2-weighted MR image shows disruption of superior popliteomeniscal fascicle (arrow). Tear cannot be seen on this image.

 


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  		Fig. 3. —45-year-old man with oblique tear of body and posterior horn of lateral meniscus. Sagittal spin-echo T2-weighted MR image shows thickening and distortion of superior popliteomeniscal fascicle (curved arrow) and extensive edema (straight arrows) posterior to capsule. Tear cannot be seen on this image.

 


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  		Fig. 4A. —16-year-old girl with intact lateral meniscus. Sagittal spin-echo T2-weighted MR image shows edema anterior (small arrow) and posterior (large arrow) to capsule.

 


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  		Fig. 4B. —16-year-old girl with intact lateral meniscus. Sagittal spin-echo T2-weighted MR image lateral to A shows intact popliteomeniscal fascicle (curved arrow) and edema (straight arrow) posterior to capsule.

 

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