Fig. 1.

59-year-old female with unilateral left axillary adenopathy noted approximately 9 days after receiving the first dose of the Pfizer-BioNTech COVID-19 vaccine in her left upper extremity which resolved on follow-up targeted ultrasound performed 7 weeks after initial presentation, which was 5 weeks after receiving the second dose. (a) Gray-scale and (b) color Doppler images of an enlarged left axillary lymph node measuring 2.6 × 1.5 × 1.6 cm with uniform cortical thickening up to 0.7 cm (arrow). (c) Gray-scale and (b) color Doppler images from targeted ultrasound performed 7 weeks after initial presentation demonstrated resolution of the previously noted unilateral left axillary adenopathy (arrow).