This is Dr. David
I am a cancer doctor.
I read PET scans all the time.
PET scans use radioactive glucose to light up areas of cancer.
but your normal body organs such as your brain, heart, kidneys, liver, all take up high levels of glucose and can normally light up bright on your PET scan. this doesn't mean cancer in the brain or cancer in the thyroid gland.
also activity on the PET scan doesn't mean your thyroid gland is overactive.
you need blood test to check your TSH and T3 and T4 levels. to know for sure your thyroid function
the FDG glucose on the PET scan can normally go into your salivary glands and get secreted into your saliva.
during the scan, the contrast can pool in your mouth and throat and light up these areas on the PET scan
these are areas of false positive uptake and doesn't mean you have cancer in these areas.
physiologic hypermetabolic activity means the body's normal physiological activities are resulting in the PET scan lighting up bright in these areas. and not cancer causing the bright areas.
let me know if you have questions.
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