What is the breast ultrasound classification standard?

Breast ultrasound classification generally refers to the Breast Imaging Reporting and Data System (BI-RADS) categories, which are used to assess the likelihood of benign or malignant breast lesions and to guide subsequent diagnostic and treatment strategies. If changes are noted on breast ultrasound, it is recommended to seek medical attention promptly.

The BI-RADS classification system includes categories from 0 to 6, each with specific meanings. Category 0 indicates an incomplete assessment, typically meaning that the current ultrasound examination cannot adequately evaluate the lesion, and further imaging such as mammography or magnetic resonance imaging (MRI) is required. Category 1 indicates a negative result, meaning there are no clinical signs of abnormality and the ultrasound reveals no suspicious findings. Category 2 indicates that although a lesion is visible, it is clearly benign. Category 3 suggests a likely benign lesion, but short-term follow-up and additional evaluation are recommended due to a less than 2% risk of malignancy. Category 4 is subdivided into 4A, 4B, and 4C: 4A lesions have a low suspicion for malignancy, 4B lesions show intermediate suspicion, and 4C lesions indicate a higher suspicion of cancer. Patients in category 4 are usually advised to undergo biopsy for definitive diagnosis. Category 5 indicates a high suspicion of malignancy, requiring appropriate diagnostic and therapeutic interventions. Category 6 is assigned when a lesion has already been confirmed as malignant by pathological biopsy.

Regardless of the BI-RADS category, ultrasound findings alone cannot replace clinical judgment or pathological diagnosis. Patients should follow their physician's recommendations for further evaluation and treatment. Additionally, maintaining a healthy lifestyle—including regular exercise, avoiding late nights, and managing stress—is also important for promoting breast health.