Reasons you may not be able to have the test or why the results may not be helpful include:

• Pregnancy. An MRI test usually is not done during pregnancy. If you are pregnant, an ultrasound test may be done instead.
• Medical devices that have metal, such as a pacemaker or an ICD. These devices may not function properly or can cause problems during an MRI scan.
• Other types of metal, such as surgical clips. If these will interfere with a breast MRI, the test will not be done.
• Inability to remain still during the test.
• Being very overweight. This may affect your ability to fit into the opening of some standard MRI machines.