A 55-year-old female asked:
what can a lit up pet scan in left subpectoral area mean in lymph node . ?
3 doctor answers • 6 doctors weighed in
Radiology 47 years experience
Several Things: A positive pet scan does not always equate with malignancy. The positive scan reflects increased metabolic activity. Causes of false positive exams include infectious diseases (mycobacterial (like tb), fungal, bacterial infection), sarcoidosis, radiation pneumonitis and post-operative surgical conditions have shown intense uptake on pet scan. Good luck!
Nuclear Medicine 34 years experience
It depends: It could be a reactive/benign lymph node from an infection...Or it could be a malignant/metastatic lymph node.
I need more information about you and why you had the scan done.
Radiology 29 years experience
Increased metabolism: Pet scans with a radioactive analog of glucose measure glucose metabolism. Uptake in a lymph node means that node is using glucose more that is normal. The reasons for that include infection, inflammation, primary malignancy or metastatic disease.
Please see your health care provider for continued medical care.
A 37-year-old member asked:
What chemical is in the injection for pet scans?
4 doctor answers • 10 doctors weighed in
Neurology 32 years experience
Radioactive glucose: Radioactive glucose, which sounds scary but is safe!
A 36-year-old member asked:
What can a pet scan show?
4 doctor answers • 9 doctors weighed in
Geriatric Psychiatry 24 years experience
Functioning: It is a functional test and shows which parts of the body are using the most glucose. This is an indirect measure of how active the cells are.
A 41-year-old member asked:
What isotope is used in the injection for a pet scan?
3 doctor answers • 8 doctors weighed in
Cardiology 37 years experience
PET scan: It depends on the question being asked. Cardiac pet scans use several different types of isotopes including rubidium-82, n-13 ammonia, and fluorine-18 deoxyglucose. These can be used to measure myocardial metabolism (fluorine-18 deoxyglucose) or coronary blood flow (rubidium-82, n-13 ammonia).
A 24-year-old member asked:
How is a pet scan conducted?
3 doctor answers • 7 doctors weighed in
Neurology 17 years experience
Track a tracer: Pet scans make use of tracers, radioactive compounds that bind to specific compounds of interest. The tracer is injected and, after a few minutes, the pet scanner looks to see where the radioactivity has ended up, and is thereby able to see how much of the compound of interest is present, and where it is located.
A 35-year-old member asked:
What can a pet scan reveal?
3 doctor answers • 9 doctors weighed in
Neurology 24 years experience
Metabolism: Pet scans used radioactively labeled glucose (rarely dopamine, or other tracers) to see how these chemicals are being used in the brain (or sometimes heart or other organs). Abnormalities of either too high or too low of a rate of usage in some areas might suggest epilepsy, dementia, cancer, Parkinson's (if looking at dopamine), or other diseases.
Last updated Jan 18, 2017
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