Patients with suspected or confirmed breast cancer need to undergo relevant examinations: 1) local examination of breast: such as breast ultrasound, mammography; 2) breast CT, MRI; 3) breast cancer is often accompanied by regional lymph node enlargement or metastasis, focus on examining lymph nodes in the breast region, including the axilla, neck and clavicular area; 4) exclude metastasis of other organs of the patient, including lung, liver, abdomen, bone and brain, CT examination can be done for chest and abdomen, MRI examination is recommended for head, ECT examination can be done for bone, and higher level equipment such as whole-body PET-CT or PET MRI is available for examination.