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Quadriceps Fat Pad Signal Intensity and Enlargement on MRI: Prevalence and Associated Findings

Christopher Roth1, Jon Jacobson1, David Jamadar1, Elaine Caoili1, Yoav Morag1 and Jeffrey Housner2

1 Department of Radiology, University of Michigan, 1500 E Medical Center Dr., TC-2910G, Ann Arbor, MI 48109-0326.
2 Departments of Orthopaedic Surgery and Family Medicine, University of Michigan, MedSport Domino's Farms, 24 Frank Lloyd Wright Dr., Ann Arbor, MI 48106.



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  		Fig. 1A. —41-year-old woman with quadriceps fat pad mass effect and anterior knee pain. Sagittal intermediate T1-weighted proton density–weighted spin-echo MR image (A) and sagittal (B) and axial (C) proton density–weighted fast spin-echo MR images with fat saturation show enlarged quadriceps fat pad (arrows) with abnormal convex posterior border and increased signal intensity equal to muscle or hyaline cartilage. Note articular muscle (arrowhead, A).

 


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  		Fig. 1B. —41-year-old woman with quadriceps fat pad mass effect and anterior knee pain. Sagittal intermediate T1-weighted proton density–weighted spin-echo MR image (A) and sagittal (B) and axial (C) proton density–weighted fast spin-echo MR images with fat saturation show enlarged quadriceps fat pad (arrows) with abnormal convex posterior border and increased signal intensity equal to muscle or hyaline cartilage. Note articular muscle (arrowhead, A).

 


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  		Fig. 1C. —41-year-old woman with quadriceps fat pad mass effect and anterior knee pain. Sagittal intermediate T1-weighted proton density–weighted spin-echo MR image (A) and sagittal (B) and axial (C) proton density–weighted fast spin-echo MR images with fat saturation show enlarged quadriceps fat pad (arrows) with abnormal convex posterior border and increased signal intensity equal to muscle or hyaline cartilage. Note articular muscle (arrowhead, A).

 


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  		Fig. 2. —35-year-old woman with abnormal infrapatellar plica, prepatellar edema, and no anterior knee pain. Sagittal proton density–weighted fast spin-echo MR image with fat saturation shows abnormal curvilinear fluid signal of infrapatellar plica (arrow) and fluid signal of prepatellar edema (arrowheads).

 

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