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49-year-old female with unilateral left axillary adenopathy noted 6 days after receiving the first dose of the Pfizer-BioNTech COVID-19 vaccine in her left deltoid muscle. (a) B-mode sonogram image shows ovular, hypoechoic lymph node with hilum absence. (b) SMI images show central and peripheral vascularization. (c) Elastosonography strain shows similar pattern of the node compared to surrounding tissue. (d) After 1 month, the cortical thickening appears uniform, with hilum evidence.
