Lipoma Arborescens of the Knee: Report of Three Cases and Review of the Literature

Figure 10

MR images on sagittal T1-weighted (a) and PD-weighted with FS (b), on coronal T1-weighted (c) and PD-weighted with FS (d), and on axial STIR (e) and T2-weighted (f) demonstrate synovial proliferation and a large primarily fat-signal mass on all MR sequences, filling much of the suprapatellar bursa with a frond-like appearance, which is surrounded by excessive joint fluid. The innumerable individual villi are small in this case, with small quantities of interposed fluid, creating a feathery appearance (arrows). These findings are indicative of a large feathery-appearing LA filling the suprapatellar recess.

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