Tonight in the Emergency Department you meet a well 62-year-old man presents to the ED with worsening right shoulder pain and associated swelling. There is a large, fluctuant mass over the right acromioclavicular joint.

(courtesy of Medscape)

What is the diagnosis?

  1. Tumor
  2. Aneurysm
  3. Acromioclavicular (AC) joint cyst
  4. Abscess
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