According to the classification criteria of breast ultrasound, breast lumps can be divided into 7 classes, which are interpreted as follows grade by grade: 1. Class 0 lumps, which mainly refer to lesions that cannot be fully evaluated and need to be further evaluated by other imaging examinations. Clinical symptoms mainly include: clinically detected lumps or masses, clinically unsuspected lumps or masses with nipple overflow, asymmetric thickening, skin and nipple changes; 2. Class 1 masses, which are negative signs, that is, no masses are found and patients can be reviewed again after 12 months; 3. Class 2 masses, which are benign signs and can basically exclude malignancy, also need to be reviewed in 6-12 months. The main types of lesions include: simple cysts or cumulus cysts, intramammary lymph nodes, breast prosthesis implants, fibroadenomas aged <25 years or >25 years but <40 years, and with little change in the image on repeated review. Fatty lobules or lipomas, definite benign calcifications such as annular calcifications, short streaks of well-defined calcifications, coarse speckled calcifications, crescent-shaped sedimentary calcifications, etc.; 4. Category 3 masses, which are those with possible benign signs but a risk of malignancy of <2%, need to be reviewed at 3-6 months. The main types of such masses include: first diagnosis of fibroadenoma age 25-40 years, complex cysts and clusters of small cysts, first diagnosis of hyperplastic nodules, clinical finding of masses with limited, asymmetric changes, and pathological diagnosis of sclerosing adenopathy are classified as category 3 or 4a; 5. Category 4 masses, which may be malignant, but with a risk of malignancy between 3% and 94%, require tissue aspiration biopsy. There are three subcategories, 4a, 4b, and 4c. Category 4a refers to those with 3%-9% malignant potential, such as atypical fibroadenomas and other benign lesions. Solid masses with 1-2 malignant signs but benign signs over 40 years old can also be classified as 4a. 4b masses are those with 10%-49% malignant potential, moderately suspected malignant lesions with 2-3 malignant signs. 4c masses are those with 50%-94% malignant potential, highly suspected malignant lesions with >3 malignant signs; as long as the masses in category 4 or above are in principle puncture biopsy to clarify the benignity and malignancy, and observation is not advisable to avoid delaying treatment in case of malignancy. 6 and 5 category masses are those with typical malignant signs and ≥95% risk of malignancy. 7 and 6 category masses are those that have been confirmed to be malignant by biopsy pathology.