A 61-year-old female presented three months following an influenza vaccination with ongoing pain since the injection and was diagnosed by MRI with subdeltoid bursitis. The patient received a short course of prednisone and several months of physical therapy before returning to pain-free function. The primary reason for injection-related subdeltoid bursitis is improper administration. It is a preventable issue, and improved training of healthcare workers on proper vaccine administration may decrease its occurrence.
Keywords: bursitis; complications; influenza vaccine; shoulder injury; side effects; subacromial bursitis; subdeltoid bursitis; technique; vaccination; vaccine administration.
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