Fig. 3.

57-year-old female with unilateral left axillary adenopathy noted 8 days after receiving the first dose of the Pfizer-BioNTech COVID-19 vaccine in her left upper extremity, noted to have significant decrease in cortical thickness to normal size of 0.3 cm on follow-up targeted ultrasound performed 17 weeks after initial presentation, which was 13 weeks after receiving the second dose, compatible with benign reactive adenopathy. (a) Gray-scale and (b) color Doppler images of a single enlarged left axillary lymph node with diffuse cortical thickening (arrow). (c) Gray-scale image from targeted ultrasound performed 17 weeks after initial presentation, demonstrated significant decrease in cortical thickness to normal size of 0.3 cm (arrow), compatible with benign reactive adenopathy.