title: Subdeltoid lipoma causing shoulder impingement syndrome - a case report.
abstract: The impingement syndrome is defined by the compression of the rotator cuff tendons against the coracoacromial arch. Several factors contribute to this condition and they are classified as structural or functional factors. The former are changes in the coracoacromial arch, proximal humerus, bursa and rotator cuff, and the latter are related to the mechanism of the upper limb by means of synchronized activity and balanced between the rotator cuff and scapular girdle muscles. The authors report here a case of parosteal lipoma of the proximal humerus, located between the muscles deltoid, teres minor and infraspinatus causing clinical signs of impingement. It is a rare occurrence, characterized as a structural cause for the onset of this symptom.
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brasil.
authors.forename: Mario
authors.initials: M
authors.lastname: Lenza
authors.affiliation: Hospital Nove de Julho, São Paulo, SP, Brasil.
authors.forename: Miguel Vicente
authors.initials: MV
authors.lastname: Lenza
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brasil.
authors.forename: Eduardo da Frota
authors.initials: Eda F
authors.lastname: Carrerra
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brasil.
authors.forename: Mario
authors.initials: M
authors.lastname: Ferretti
mesh_terms: D000369:Aged, 80 and over; D057645:Deltoid Muscle / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D008067:Lipoma / Q000150:complications* / Q000473:pathology / Q000601:surgery; D008279:Magnetic Resonance Imaging; D019042:Muscle Neoplasms / Q000150:complications* / Q000473:pathology / Q000601:surgery; D017006:Rotator Cuff / Q000473:pathology / Q000601:surgery; D019534:Shoulder Impingement Syndrome / Q000209:etiology* / Q000601:surgery; D016896:Treatment Outcome