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. 2022 Aug 26;42(7):1897–1911. doi: 10.1148/rg.220045

Figure 5.

Axillary edema in a 51-year-old woman who underwent screening mammography 3 days after receiving the first dose of the Pfizer-BioNTech SARS-CoV-2 vaccine in the left arm. Bilateral MLO mammograms show asymmetric soft-tissue stranding (arrow) in the left axilla without an associated breast abnormality. This finding is most consistent with axillary edema in the setting of recent vaccination and is benign (BI-RADS 2). Note that the edema is centered around superiorly located lymph nodes, not the inferiorly located lymph nodes.

Axillary edema in a 51-year-old woman who underwent screening mammography 3 days after receiving the first dose of the Pfizer-BioNTech SARS-CoV-2 vaccine in the left arm. Bilateral MLO mammograms show asymmetric soft-tissue stranding (arrow) in the left axilla without an associated breast abnormality. This finding is most consistent with axillary edema in the setting of recent vaccination and is benign (BI-RADS 2). Note that the edema is centered around superiorly located lymph nodes, not the inferiorly located lymph nodes.