Positron emission tomography (PET scan) is one of the newest forms of imaging tests. Most often, this technology is used in patients with confirmed breast cancer to evaluate the spread of disease and ensure that the most appropriate form of treatment is selected. A PET scan may be combined with computed tomography (CT) to provide both an anatomical and functional view of the suspect cells. With all this information, doctors can better differentiate between healthy and cancerous cells, even when the cancer is too small to detect by conventional imaging. This is particularly important when looking to see if cancer has spread ("metastasized") from the breast to other parts of the body.
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