Positron emission tomography (PET) scan

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PET scan of the chest for cancer

Image of normal X-ray compared to PET scans for cancer detection

A PET scan, unlike a normal X-ray, can detect cancer before organ or gland enlargement occurs. Here a normal X-ray of the chest (left) is compared with a PET scan of the chest producing normal results (top right) and a PET scan revealing cancer that's spread to the lymph nodes (bottom right).

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