Breast nodule aspect ratio >1 is a sign of malignancy, but not all of them are caused by malignant breast cancer, and need to be combined with the shape of the nodule, margins and other comprehensive judgment. Breast nodule aspect ratio >1 means that the anteroposterior or vertical diameter of the nodule is larger than the transverse or horizontal diameter, i.e. the long axis of the lump is not parallel to the skin, which is a description of the direction of the lump. In general, a breast nodule aspect ratio >1 is a sign of suspected malignancy and carries some risk of being caused by a malignant nodule, i.e. breast cancer. However, the breast nodule aspect ratio is a description of the mass based on ultrasound, molybdenum imaging, etc. It is an assessment of the risk of malignancy, and it is difficult to confirm whether the mass is malignant or not with 100% certainty. It is difficult to confirm whether a lump is malignant or not. In general, the assessment of malignant risk of breast nodules should be based on the shape of the nodule, margins, echogenicity, calcification, blood supply, etc., and histologic examination after puncture or excision is required to confirm benignity or malignancy. Patients are advised to consult their specialists with the reports and judge the available examination reports and follow the doctor’s instructions for further examination and treatment.