Fig. 4.

(Case 3): A 76-year-old woman presented with a palpable lump in her left axilla and no breast symptoms. She received the 1st dose of AstraZeneca COVID-19 vaccine in her left arm 8 weeks prior. Ultrasound of the left axilla demonstrated a large abnormal appearing lymph node, suspicious of malignancy (left). Mammography showed no breast abnormalities. Lymph node core biopsy demonstrated non-specific reactive changes. A 6-week follow-up ultrasound scan demonstrated no significant change in size and appearance of the node. However, the patient had the 2nd vaccine dose administered in the left arm the previous week, and therefore, biopsy was not repeated, and a further ultrasound scan was arranged in 6 weeks. This showed marked improvement, both clinically and radiologically, and the patient was reassured and discharged (right).