COVID booster side effects: How long does axillary lymphadenopathy last after vaccination?

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Left axillary ultrasound performed same day as mammogram (two days after booster dose of Pfizer COVID-19 vaccine administration) shows enlarged left axillary lymph node (calipers) with thickened cortex, measuring 6 mm. Image courtesy of ARRS/AJR.

Axillary lymphadenopathy following COVID vaccination and/or boosters is a finding all radiologists must be mindful of when interpreting imaging, but new data clarify the timeline for when the side effect should resolve.