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ALN-Ultra contains paired ultrasound images and videos from 257 breast cancer patients, along with expert diagnostic and biopsy results. This dataset facilitates the development of machine learning algorithms based on 2D images and 3D videos, aiming to improve diagnostic accuracy and understand the contribution of different modalities of data to ALN metastasis judgment. To ensure the availability of clinical data in the dataset, we provide patient clinical labels at the following link: https://docs.google.com/spreadsheets/d/1CDja2j_Z7UdkVqzxzPZPdMqDkQ2EmdTq/edit?usp=drive_link&ouid=112419306061326771291&rtpof=true&sd=true