Important early detection method – mammography x-ray mammography is recognized as the most valuable in the diagnosis of early breast cancer. In the United States, 12% to 15% of breast cancers diagnosed in recent years are ductal carcinoma in situ, and 90% of them are detected by mammography. It has been reported that the sensitivity of mammography for breast cancer diagnosis is 82%-89% and the specificity is 87%-94%. Calcified foci are one of the main x-ray signs of breast cancer and even the only sign of clinically inaccessible breast cancer, and showing them is the greatest advantage of mammography. It has been found that about half of the breast cancers that are not detected as lumps on breast screening are detected due to the presence of microcalcifications. In contrast, 70% of ductal carcinomas are detected due to the presence of microcalcifications on x-ray. Calcified spots in breast cancer usually appear as mucoid, clustered or regionally distributed along the ducts. If there are more than 15 small calcified foci per square centimeter, breast cancer is often considered.