Presentation
Painless soft mass at the anterolateral aspect of right knee visible mainly on a flexed knee.
Patient Data
Age: 45 years
Gender: Female
From the case:
Hoffa fat pad herniation
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There is a soft tissue mass of the anterolateral aspect of the knee measuring 23 x 20 x 13 mm, eliciting an isosignal to the Hoffa fat pad on all sequences. The axial sequences show a focal defect in the lateral patellar retinaculum through which the Hoffa fat pad is herniated.
Case Discussion
MRI features of Hoffa fat pad herniation.
Hoffa fat pad herniation occurs in preschool-aged and young children and defined as herniation of infrapatellar fat through a defect in the lateral retinaculum.
In a recent study, it was suggested that it may be considered as a normal variant rather than a pathologic change 1.