Discussion of Os acromiale
- An os acromiale is an acromial epiphysis caused by failure of the acromial ossification center to fuse properly.
- It occurs in 1%–8% of the population
- Although it is usually asymptomatic, it may become symptomatic by narrowing the space available for the supraspinatus tendon.
- Should not be confused with an acromial fracture.
 Imaging Findings for Os acromiale
- The unfused anterior acromial ossification center is best seen on axially views.
Patient #2: MRI demonstrates bilateral Os acromiales
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 References for Os acromiale
- Athanasios Papatheodorou, Panagiotis Ellinas, Fotios Takis, Antonios Tsanis, Ioannis Maris, and Nikolaos Batakis. US of the Shoulder: Rotator Cuff and Non–Rotator Cuff Disorders. RadioGraphics 2006 26: e23.