title: Case reports: ossified mass of the rotator cuff tendon in the subacromial bursa.
abstract: Unlike calcification, ossification is infrequent in the rotator cuff. We describe the clinical, radiographic, and pathologic findings in 64-year-old man with an ossified mass arising from a calcified portion of the rotator cuff tendon within the subacromial bursa. Mechanical stress and ischemic events are possible causes of cartilage formation followed by endochondral ossification, producing a mass causing outlet impingement.
authors.affiliation: Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, Japan.
authors.forename: Isshin
authors.initials: I
authors.lastname: Matsumoto
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ito
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Tomo
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nakao
authors.forename: Kunio
authors.initials: K
authors.lastname: Takaoka
mesh_terms: D000174:Acromion; D001175:Arthrography; D001182:Arthroscopy; D002061:Bursa, Synovial / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D017006:Rotator Cuff / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D020069:Shoulder Pain / Q000175:diagnosis / Q000209:etiology / Q000601:surgery