Figure 1. A 56-year-old woman with invasive lobular carcinoma of the left breast. The woman received the first dose of the Moderna coronavirus 2019 vaccine in the left deltoid muscle 22 days before the preoperative axillary US. (A, B) Axillary US demonstrates lymphadenopathy with cortical thickening (arrow) and increased nonhilar blood flow (arrowheads). (C) US guided-biopsy was performed and was negative for carcinoma. (D) T1-weighted fat-saturated MRI demonstrates corresponding lymphadenopathy at level I (transparent arrow). There was no lymph node metastasis on the final sentinel lymph node biopsy.
US = ultrasound; MRI = magnetic resonance imaging.