title: Sonography of the accessory head of the biceps brachii.
abstract: Anatomic variations in the anterior aspect of the shoulder, such as an accessory head of the biceps brachii muscle, are not uncommon. The magnetic resonance imaging and arthroscopic appearance of the accessory head of the biceps brachii has been recently described. This series demonstrates the sonographic appearance of the accessory head of the biceps brachii in the bicipital groove. It is an asymptomatic, flat, echogenic structure with average measurements of 7.7 × 1.2 mm in cross section. Knowledge of this anatomic variant can avoid the misdiagnosis of a longitudinal split tear and improve the accuracy of sonography.
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA.
authors.forename: Ricardo Augusto
authors.initials: RA
authors.lastname: Lutterbach-Penna
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA.
authors.forename: Monica Kalume
authors.initials: MK
authors.lastname: Brigido
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Robertson
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA.
authors.forename: Sung Moon
authors.initials: SM
authors.lastname: Kim
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA.
authors.forename: Jon A
authors.initials: JA
authors.lastname: Jacobson
authors.affiliation: Division of Musculoskeletal Radiology, University of Michigan Health System, Ann Arbor, Michigan USA. fessell@umich.edu.
authors.forename: David P
authors.initials: DP
authors.lastname: Fessell
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D012782:Shoulder / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D013710:Tendons / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014463:Ultrasonography
keywords: biceps; musculoskeletal ultrasound; shoulder; sonography; tendon; variant