pigmented villonodular synovitis
Definition: diffuse outgrowths of synovial membrane of a joint, usually the knee, composed of synovial villi and fibrous nodules infiltrated by hemosiderin- and lipid-containing macrophages and multinucleated giant cells; the condition may be inflammatory, although recurrence is likely to follow incomplete removal.
Synonym(s): chronic hemorrhagic villous synovitis
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