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25-year-old female with unilateral left axillary adenopathy noted 5 days after receiving the first dose of the Pfizer-BioNTech COVID-19 vaccine in her left deltoid muscle. (a,b) B-mode sonogram image shows ovular lymph nodes with asymmetric cortex and dislocate hilum. (c) After 2 months, SMI image shows normal vascularization (d) and cortical thickening appears uniform with normal hilum localization.
