A breast nodule with a transverse ratio greater than 1 indicates that the breast nodule is more likely to be a malignant tumor, and it is recommended that the breast nodule be seen in a hospital promptly for treatment. Breast Nodule Aspect Ratio is a method of measuring breast nodules. It mainly measures the ratio of the straight line parallel to the skin and the straight line perpendicular to the skin when the tumor is illuminated by the ultrasound probe. The benign or malignant status of the tumor is inferred from the ratio. If the aspect ratio is less than one, the tumor is generally benign, if the aspect ratio is greater than one, most of the tumor is malignant. In order to determine the nature of the tumor, it is necessary to combine with some other examination results, such as mammography and other examinations. If the aspect ratio is greater than one side, it indicates that the tumor is more likely to be malignant, and it is recommended to go to the hospital for consultation and treatment in time.