The accessory head of the biceps brachii muscle is a normal anatomical variant and incidentally seen in some individuals with shoulder problems who were referred for shoulder MRI.
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Epidemiology
The prevalence of the condition has been reported in 9.1-22.9% of the population especially in the Asian groups.
Radiographic features
MRI
On MRI, an accessory biceps tendon displays a hypointense structure within the bicipital groove that is usually flattened and can be misdiagnosed as a longitudinal tear of the long head of the biceps tendon without carefully following the origin of the accessory tendon.
Additional origins of the accessory bicipital head include the articular capsule of the glenohumeral joint, humerus tubercles, and coracoid process 1-3.
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