Contrast-enhanced ultrasound to predict malignant upgrading of atypical ductal hyperplasia.

"Declarations Ethics approval and consent to participateThis retrospective study was approved by the Medical Ethics Committee of Chinese PLA General Hospital (No. S2021-683-01). Informed consent was waived because of the retrospective design. The study was performed in accordance with the Declaration of Helsinki. Consent for publicationAll authors gave their approval for manuscript’s publication. As a retrospective study, patient informed consent (e.g., reproduced images) was waived. Competing interestsThe authors have no relevant financial or non-financial interests to disclose. Competing interests The authors have no relevant financial or non-financial interests to disclose."

"Funding This work was supported by the National Natural Science Foundation of China (No. 82071925), the Military Health project (No. 22BJZ23) and the Equipment Comprehensive Research Project (No. LB20211A010011)."