A PET scan is most often used when other tests, such as MRI scan or CT scan, do not provide enough information.
A breast PET scan is used only after a woman has been diagnosed with breast cancer. It is done to see if the cancer has spread to other parts of the body, such as the lymph nodes, liver, lung, or bones.
If you have breast cancer, your doctor may order this scan:
- Soon after your diagnosis to see if the cancer has spread
- After treatment if there is concern that the cancer has come back
- During treatment to see if the cancer is responding to treatment
A PET scan is not used to screen for, or diagnose, breast cancer.