Lipoma arborescens of the knee

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Abstract
Lipoma arborescens is a rare intra-articular lesion, consisting of collections of fat beneath the synovial lining producing clusters of swollen villous projections. It macroscopically resembles pigmented villonodular synovitis, but is macroscopically and histologically different from a synovial lipoma. Histologically, lipoma arborescens is indistinguishable from other collections of subsynovial fat, the only differences being its large size and frond-like macroscopic appearance. The alternative name of “villous lipomatous proliferation of the synovial membrane” has been suggested (Hallel et al, 1988).

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