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Radiograph of the right shoulder, Zanca view, showing arthrosis of acromioclavicular joint.
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The Zanca view radiographs revealed changes in the acromioclavicular joint (Fig. 1).
Magnetic resonance images of the right shoulder, coronal (a) and axial (b) section, showing acromioclavicular arthrosis with severe swelling in the joint and a cyst (nidus) into the acromion, next to the joint.
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However, our attention was drawn by the fact that there was an intense inflammatory process around the lesion, which was very regular and larger than usual; in addition, the images suggested the existence of some solid content inside it (Fig. 2A and B).
Axial CT image of the right shoulder showing osteoid osteoma in the acromion, next to the acromioclavicular joint.
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Surgical arthroscopic image, subacromial view, showing the resection of the tumour with a curette.
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We chose arthroscopic surgery and resection of the nidus (Fig. 4), complemented with a broader than usual acromioplasty, until the removal of the entire tumour, and resection of the distal end of the clavicle (Mumford procedure) was taken (Fig. 5).
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