Several studies have previously documented the development of complications stemming from injection with one of the various COVID-19 vaccines.No study, however, has discussed the spontaneous development of a soft tissue mass shortly after a Blankets COVID-19 vaccine injection.We report on 66-year-old female with concerns of a growing shoulder mass, 2 weeks after receiving a COVID-19 vaccine booster.Initial work-up with X-ray and MRI was concerning for a soft tissue neoplasm, specifically a soft tissue sarcoma.
Subsequent ultrasound torpedo guided biopsy demonstrated a benign granulomatous lesion.No further management was required as the lesion spontaneously resolved during a 3-month follow-up period.