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

Figure 7

MR images at the same sagittal level on T1-weighted (a), PD-weighted with FS (b), and T1-weighted with FS after iv administration of gadolinium (c) demonstrate medial compartment osteoarthritis with marginal osteophytes, chondral lesions, subchondral changes, and a complex tear of the posterior horn of medial meniscus. Mild villous frond-like fatty subsynovial hyperplasia is present in the suprapatellar bursa associated with synovial proliferation, which is enhanced after iv administration of gadolinium, and joint effusion (arrows). MR images at the same axial level on T1-weighted (d), PD-weighted with FS (e), and T1-weighted with FS after iv administration of gadolinium (f) confirm the above findings (arrows), which are strongly suggestive of LA.

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