title: Subacromial bony erosion: a rare presentation of pigmented villonodular synovitis of the shoulder.
abstract: Pigmented villonodular synovitis (PVNS) rarely affects the shoulder. We describe two cases of PVNS arising from the shoulder joint, which caused rotator cuff tears and sub-acromial bony erosion, and which were treated arthroscopically. Sub-acromial erosion is frequently associated with various glenohumeral joint disorders, but it has not been reported in association with PVNS. We believe PVNS should also be considered in the differential diagnosis of patients who present with sub-acromial erosion.
authors.affiliation: Department of Orthopaedic Surgery, Daejeon St. Mary's Hospital, Catholic University of Korea, Joong-ku, Daejeon, South Korea.
authors.forename: Jong-Hun
authors.initials: JH
authors.lastname: Ji
authors.forename: Mohamed
authors.initials: M
authors.lastname: Shafi
authors.forename: Sang-Eun
authors.initials: SE
authors.lastname: Park
authors.forename: Weon-Yoo
authors.initials: WY
authors.lastname: Kim
mesh_terms: D000174:Acromion / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D000368:Aged; D001182:Arthroscopy; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D011859:Radiography; D017006:Rotator Cuff / Q000473:pathology / Q000601:surgery; D000070636:Rotator Cuff Injuries; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D020069:Shoulder Pain / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D013586:Synovitis, Pigmented Villonodular / Q000150:complications / Q000175:diagnosis* / Q000601:surgery