Breast lumps are a common ultrasound sign in women and can be benign or malignant. Patients who find breast lumps are often most concerned and interested in the benignity or malignancy of the lump. Sonographically, breast lumps are broadly divided into three categories: cystic, substantial and mixed. Most cystic masses are cystic hyperplasia-like lesions, and simple breast cysts are rare, although there is a possibility of milk stasis during lactation and breast abscesses during the inflammatory phase. In general, cystic lesions are mostly benign and cystic malignant lesions of the breast are quite rare. There are many types of parenchymal masses, including fibroadenomas, intraductal papillomas, breast cancers, and nodules with verrucous hyperplasia, and occasionally sarcomas and lymphomas. The sonographic manifestations of different tumors have their own specific manifestations, and of course there are some crossover cases, which I will explain to you step by step later. With the accelerated pace of modern life, mental stress, living habits, atmospheric environment, diet and other factors contribute to the increasing incidence of modern women year by year, and the age of incidence is trending towards younger age. Some people keep asking who is more accurate in diagnosing breast cancer, mammogram or ultrasound, but here I would like to tell you that both tests have their own advantages and neither can replace the other. In the years when ultrasound was not developed, mammography was always the first choice for breast cancer, and most of the international community still thinks so, but in practice, with the rapid development of ultrasound technology in the past 5-10 years, clinicians rely more on ultrasound examination. For the patient, there is really no need to figure out who is more accurate, as long as the diagnosis is sufficient. In my experience, ultrasound is completely confident in most typical breast cancers, and certainly in combination with mammography. The advantage of ultrasound also lies in the ability to perform ultrasound-guided puncture biopsy histology and cytology of the lump for the purpose of confirming the diagnosis, and also to perform ultrasound-guided minimally invasive McMurdo spinotomy for the dual purpose of diagnosis and treatment.