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Timeline of imaging examinations and biopsy. The day of administration of the second COVID-19 vaccination dose was designated as Day 0. Breast cancer was diagnosed on Day-9 by core needle biopsy under ultrasound (US) by the prior clinician. At our hospital, US②, PET, and MRI were performed to evaluate the clinical stage of breast cancer on Days 18, 19, and 28, respectively. Fine needle aspiration (FNA) under US for swollen lymph nodes were performed on Days 38 and 49.
