The Society of Breast Imaging (SBI) in the United States is recommending women wait at least four weeks after receiving a COVID-19 vaccine to schedule a mammogram due to the potential side-effect of swollen or tender lymph nodes in the armpit. Changes in the lymph nodes can be a sign of breast cancer and the concerns are this could lead to false readings on mammograms leading to further unnecessary testing.
This advice was issued based on the rates of swelling and tenderness in the lymph nodes post the Moderna COVID-19 vaccine and Pfizer BioNTech COVID-19 vaccine in the United States. Whilst rare in people who have received the Pfizer BioNTech vaccine (which is currently provisionally registered for use in Australia), the SBI notes the incidence rates are most likely higher than reported and accordingly issued the aforementioned advice to separate mammograms from COVID-19 vaccines by four to six weeks.
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