This study plans to find the most suitable lymph node cortex thickness and abnormal lymph node features to define suspicious lymph nodes. Then, ultrasound-guided core needle biopsy of axillary lymph nodes will be done, aiming to provide some guidance for the biopsy.
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Maximum cortical thickness of the lymph node (mm)
Timeframe: Measurements should be performed prior to treatment initiation, with a time interval not exceeding 4 weeks between the measurement and pathological examination.