pet scan accuracy cancer detection

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Dr. Chakshu Gupta answered:

Is a PET scan used for colon cancer detection instead of a colonoscopy?

No

Cancer
PET scans are used for staging cancer (assess if it has spread to other tissues), not for screening.
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Dr. Larry H. Wilf answered:

Are PET scans accurate 8 weeks after radiation therapy to see if cancer has spread?

No

Radioactive
I assume your doctor is scanning you to establish a baseline for future comparisons.
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What does a cancer free pet scan show? When a PET scan shows that a person is cancer free, does that really mean they're done with cancer? Is it cured? Are there any general statistics for a person who had cancer, but a pet scan later showed that the canc

PET

PET scans are used for diagnosis, staging, and restaging of certain kinds of cancers such as lung, colorectal, esophageal, and head and neck cancers, and for monitoring response to therapy in breast cancer. Different kinds of cancers behave differently, and there is no guarantee that a given cancer is completely "cured," even following complete remission. In general, evidence of a complete remission on a PET scan is a very favorable prognostic sign, and indicates that treatment was successful. Followup PET scans are still performed at regular intervals, often for the patient's lifetime, in order to monitor for any possible recurrence that might require new treatment. In general, if follow-up PET scans continue to show no evidence of disease over a period of many years, the likelihood of recurrence is low.
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Are PET scans used for ovarian cancer?

Yes

Cancer
Yes
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On a pet scan, are the dark areas cancer?

Yes and no

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Areas with cancer are usually hypermetabolic in a PET scan due to the increased uptake of the radioactive glucose by cancerous cells. Looking at an FDG PET scan alone, you can grossly see "dark" areas in the brain, heart, kidneys and bladder and these are due to physiologic distribution/excretion of FDG. Not all "dark" is cancer and cancer is often but not always "dark".
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Should a pet scan show any cancer?

Glucose

Pets
Pet scan relies on the theory that tumors utilize a significant amount of glucose. Many different types of cancer can show up on pet scan but certain types of cancer are much more FDG avid. Low grade tumors usually have much less uptake than high grade tumors. In addition, mucinous neoplasms often do not have much FDG uptake. Small size tumors or micrometastases also may not show up on pet.
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Should pet scans continue to be part of cancer surveillance?

Yes

Pet%20scan
Not every cancer should be followed with PET/CT. But when the cancer is visible by this technology, it is often helpful in treatment planning and follow up. Here is link: http://www.petscaninfo.com/zportal/portals/pat/cancer
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Dr. Andrew Turrisi answered:

My husband had colon cancer, had a colon resection and chemo. he has had 2 pet scans since. Churining?

A PET scan is

Cancer
the most expensive imaging test. Using it to routine follow up can be justified if it alters care. Usually there is a defined course (# of cycles) and re-staging is done regularly with CT scans. Many insurers engage "pre-approval" screening to prevent over use. There are second and third line treatments for recurrent colon cancer, but CT scans do a good job of picking this up
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Could a pet scan detect ovarian cancer?

Possibly

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If tumor metabolically active will pick up isotope F18 FDG , analog of glucose. Imaging with Pet ct will detect abnormality. Most malignant tumors are active, but not all.
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Dr. Andrew Turrisi answered:

Do PET scans show lung cancer?

Sort of...

Cancer
The PET scan non-specifically show very metabolically active (consuming lots of energy), and lung cancer and its metastasis fit that category. It is NOT specific. Benign conditions like Sarcoid can also make PET studies glow very brightly as well. Slow growing lung cancer, broncheoalveolar may not be PT avid.
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