COVID-19 vaccine may cause swelling of local lymph nodes. Does this affect mammogram results?
When you attend a mammogram, it is recommended that you mention to your doctor or radiographer that you have had a COVID-19 vaccination recently.
This is because occasionally the vaccine can cause swelling of the lymph nodes in the armpit near to the injection-site. This usually settles after a few days after vaccination but may be detectable on a mammogram for up to a few weeks. In this case, it is advised to monitor such lymph node changes for at least 6 weeks after vaccination. You do not need to delay your vaccination or your mammogram.
Click this link for further information from BreastScreen Aotearoa.
Edmonds CE, Zuckerman SP ,Conant EF. Management of unilateral axillary lymphadenopathy detected on breast MRI in the era of coronavirus disease (COVID-19) vaccination. AJR: American Journal of Roentgenology, 2021.