Breast ultrasound Active contours 1 Balloon snake 1 Balloons 1 COVID-19 1 COVID-19 vaccination 1 Case reports 1 Characterization 1 Common findings 1 Condition 1 Echogenicity 1 Image segmentation 1 Imaging features 1 Lymphadenopathy 1 Malignant mass 1 Mammography 1 Medical imaging 1 Potential imaging 1 ROC curves 1 Receiver operating characteristics 1 Semi-automated 1 Sensitivity and specificity 1 Transient ipsilateral breast edema 1 Ultrasonics 1 Vaccines 1