Echo-free nodules in the breast are breast cysts. Echo-free nodules found by ultrasound examination, breast cysts are benign tumors, breast cysts have an envelope and there is fluid within the envelope. If the cystic nodule is relatively small, simple ultrasound follow-up observation, no obvious changes and no uncomfortable symptoms can be done without treatment. If the cyst is relatively large, it can be treated by puncture and fluid extraction, and the extracted fluid is sent for cytological examination to guide the treatment according to the nature of the specific fluid, or it can be removed by surgery. Regardless of the size of the cyst need to follow up and observe according to the specific situation. If obvious changes in the cystic fluid and cystic wall are found, try to choose surgical excision to exclude malignant tumor and send pathological examination after surgical excision. Usually do a good self-examination of the breast or go to the hospital regularly on time to achieve early detection and early treatment.