Fig. 1.

61-y-old male patient with right supraclavicular lymphadenopathy that developed 5 d after first dose of AstraZeneca COVID-19 vaccine in left arm. A, B. Axial and coronal enhanced neck CT performed 21 d after vaccination demonstrated multiple enlarged, clustered lymph nodes with perinodal infiltration (arrows) in the right supraclavicular area. C. Ultrasonography performed 4 wk after vaccination showed several enlarged oval lymph nodes (arrows) with asymmetric cortical thickening, preserved fatty hilum and mild perinodal infiltration. The extent of lymphadenopathy had decreased, relative to the initial neck CT.