Lipoma
Variant: Lipoma Arborescens / Villous Lipomatous Proliferation of the Synovial Membrane / Synovial Lipomatosis
Diagnostic Criteria
- Synovial lined villous proliferation
- Villi are diffusely infiltrated by mature fat
- Grossly appears as a yellow papillary process
- Usually involves large joints
Clinical
- May be associated with trauma and arthritis
- Fully developed cases are infrequent but fatty infiltration of chronic papillary synovitis is common
- May be a reactive process
- May present as a chronically swollen joint
Bibliography
- Hallel T, Lew S, Bansal M. Villous lipomatous proliferation of the synovial membrane (lipoma arborescens). J Bone Joint Surg Am. 1988 Feb;70(2):264-70.
