B-mode and Doppler ultrasonography patterns of axillary and supraclavicular lymphadenopathy associated with mRNA COVID-19 vaccine

In this study, we present the ultrasound imaging features of lymph nodes arising in regional node chain after first or second dose Pfizer-BioNTech COVID-19 vaccine. Ipsilateral lymphadenopathy adjacent to vaccine injection site is an extremely rare but expected adverse reaction following vaccination. Although axillary more common, cases supraclavicular have also been reported widespread vaccination against COVID-19. Ultrasonography examinations were performed on seven patients with no previous pathological conditions, who presented our radiology department receiving Bilateral axillary, and subclavicular stations explored. These typically enlarged hypoechoic loss fatty hilum, asymmetric diffuse cortical thickening, increased hilar vascularization color doppler ultrasonography ipsilateral regions. Radiologists clinicians should be aware ultrasonographic these inform patient that are often a self-limiting process. Thus, unnecessary biopsies avoided, treated conservatively.