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41-year-old male with palpable unilateral sopraclavicolar adenopathy noted 3 days after receiving the first dose of the Moderna COVID-19 vaccine in his left deltoid muscle. (a) B-mode sonogram image shows 2 ovular hypoechoic lymph nodes with hilum absence. (b) SMI image shows central and peripheral vascularization (c) Elastonography strain shows similar pattern of the node compared to surrounding tissue. (d) After 1 month, the cortical thickening appears uniform with hilum evidence.
