title: Multiple cutaneous metaplastic synovial cysts.
abstract: The cutaneous metaplastic synovial cyst is a recently described lesion that characteristically presents as a solitary, tender subcutaneous nodule. On histopathologic examination, the lesion is characterized by a cystic structure with villous-like projections and a lining resembling hyperlastic synovium. The cause of cutaneous metaplastic synovial cysts is unclear, but trauma is presumed to be a precipitating factor, as most reported cases have a history of antecedent cutaneous injury. Here we present a case of multiple, bilateral cutaneous metaplastic synovial cysts in a 72-year-old white man with rheumatoid arthritis. This is the first reported case of a patient with multiple lesions. The characteristic clinical and pathologic features of this lesion, along with proposed cause, are reviewed herein.
authors.affiliation: Division of Dermatology, Kansas City VA Medical Center, Missouri, USA.
authors.forename: S R
authors.initials: SR
authors.lastname: Singh
authors.forename: A S
authors.initials: AS
authors.lastname: Ma
authors.forename: A
authors.initials: A
authors.lastname: Dixon
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications; D002081:Buttocks; D006801:Humans; D008297:Male; D012871:Skin Diseases / Q000150:complications / Q000473:pathology*; D013581:Synovial Cyst / Q000150:complications / Q000473:pathology*