A 56-year-old aunt came to our breast clinic because of some pain and discomfort in her left breast. The outpatient doctor routinely prescribed breast ultrasound and mammogram for her age group, and the results were as follows: 1. Ultrasound showed cystic echogenic area in both breasts, with no obvious abnormality in the rest of the breasts, and there was no obvious lymph node enlargement in both axillae; 2. Mammogram showed malignant calcified spots on the right upper outer breast. She was admitted to the hospital and underwent breast MRI, which showed an obvious intensified signal area in the outer right breast, and was highly suspicious of breast cancer; the result of coarse needle puncture in the outer right breast was: invasive carcinoma was detected; then she underwent modified radical surgery, and postoperative macroscopic specimen pathology was: carcinoma in situ of the right breast duct with half-small amount of invasive carcinoma component.