A 54-year-old female asked:
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diagnosed- malignant melanoma 5/2017 diagnosed - treated for anal cancer 5/2016. pet scan done in march '16. if mm has spread, wouldn't pet scan show?

1 doctor answer
Dr. Sewa Legha
49 years experience Medical Oncology
PET scan is a good t: PET scan is a good test to detect metastatic cancer. In fact it is our best imaging test to catch metastases early. Yet it has some limitations in that it can not show microscopic tumors/ small # of cells in the body...it only shows tumors that are bigger than half a centimeter (>5 mm). That is why this test has to be repeated every 3 to 4 months when there is a risk for the tumor to come back.
Answered on Apr 24, 2018

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