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Case 068

Os acromiale

A normal shoulder

Findings

This is an axial view of the shoulder.

1. 1. Glenoid
2. 2. Coracoid process
3. 3. Acromion process

2 is anterior to 3, ie the upper part of the film as displayed is anterior.

It demonstrates the os acromiale, an unfused acromial apophysis. The acromial apophysis is a secondary ossification centre which normally fuses aged 18 to 20 years. This appearance is a normal variant which is often mistaken for a fracture on the axial view. It is usually bilateral.

Diagnosis

Os acromiale

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