Magnetic resonance imaging (MRI) of the breast is a commonly used test in breast imaging, mainly for the examination of benign and malignant breast tumors and for comparison before and after chemotherapy. MRI of the breast is enhanced and requires contrast agents to enhance the contrast. Before the examination, you should pay attention to the following: 1. Avoid doing the examination before menstruation because the breast tissue is congested and edematous before menstruation, and the hyperplasia is obvious, which can easily interfere with the normal results; do not perform MRI during pregnancy as much as possible to avoid the effect on the fetus. 2, first make an appointment for the examination, many hospitals need to make an appointment in advance for the MRI, first take the examination application form, apply at the MRI window and schedule the examination. Before the examination, you need to take an indwelling needle, which is used for the contrast agent during the examination, and then go to the nurse’s station or pharmacy to receive the contrast agent for the examination and bring it to the MRI room for preparation before the examination. 3. During the examination, do not wear underwear or metal ornaments such as necklaces to avoid false images. 4, contrast allergy There are a small number of patients, when using enhanced contrast agent, allergic performance, need to tell the physician in time to deal with, to avoid life-threatening, allergy can show sudden panic, palpitations, throat obstruction, skin rash, itching and so on.