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[This corrects the article DOI 10.1016/j.afjem.2018.01.003.].A 59 year-old male presented to the county emergency department (ED) in southeastern United States for evaluation of a progressively worsening lump on his left shoulder. He describes it as painful and suggests "it might be a tumor". There were no other associated complaints. On physical examination, there was a firm, non-tender, non-mobile mass without erythema or warmth, superior to the patient's left acromioclavicular (AC) joint. Both hawkins and empty can test were positive