Reading your PET scan report
'Mildly FDG Avid' vs — 'Intensely Avid' — What the Qualifier Means
When a PET scan report says 'mildly FDG avid' or 'intensely FDG avid', the qualifier is the word that is hardest to read alone. This page explains what those words mean — not what your specific result means, which only your doctor can tell you.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- FDG avid is not a diagnosis — It means a tissue absorbed the radioactive tracer. That fact alone does not confirm cancer.
- The qualifier describes degree — Mildly, moderately, intensely — these words say how much tracer was absorbed compared to surrounding tissue.
- Mild is not automatically safe — Some cancers show only mild FDG uptake. Mild avidity can also reflect inflammation or healing tissue.
- Intense is not always cancer — Active infection and inflammation can produce high FDG uptake. Clinical context determines interpretation.
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FDG avid means a tissue absorbed the radioactive tracer used in a PET scan. Cells that use glucose rapidly — including many cancer cells, but also inflamed or infected tissue — absorb more tracer. The qualifier, mildly or intensely, describes the degree of that absorption. Mild does not automatically mean safe, and intense does not always mean cancer.
What does 'FDG avid' mean on a PET scan?
FDG is a form of radioactive sugar injected before your PET scan. Cells that use glucose rapidly absorb more of it. The scanner detects where it has collected in the body.
Avid means 'absorbs eagerly'. An FDG-avid area is one where the tracer gathered. The qualifier — mildly, moderately, or intensely — describes how much was absorbed compared to a reference, usually the level in normal surrounding tissue.
Cancer cells often absorb FDG quickly, but so do inflamed tissue, infections, healing wounds, and normal organs such as the brain and heart. The qualifier alone does not identify what type of tissue is causing the uptake.
What do the words mildly, moderately and intensely avid mean?
- Mildly FDG avid
- The area absorbed slightly more tracer than the reference level. Can reflect low-grade tumour activity, chronic inflammation, healing tissue, or normal variation in certain organs.
- Moderately FDG avid
- The area absorbed a noticeable amount of tracer — more than mild, less than intense. Significance depends on the clinical context and location.
- Intensely (or markedly) FDG avid
- The area absorbed a high level of tracer. Active cancer is one cause; acute infection and active inflammation are others. Location and clinical history guide interpretation.
- SUV (standardised uptake value)
- A number the scanner calculates to measure tracer uptake. Mildly avid areas have lower SUVs; intensely avid areas have higher ones. The relevant threshold varies by tissue type and scanning centre.
- Physiologic uptake
- The normal, expected FDG absorption in a particular organ. The brain, heart, kidneys and bladder have naturally high uptake. Avidity is always described relative to this baseline.
- Non-FDG avid
- The area did not show meaningful uptake above background. This is not the same as 'clear' — some cancers absorb little FDG and are better detected by other imaging.
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What should I ask my doctor about this finding?
- Which specific area is described as FDG avid, and which organ does it involve?
- What does this level of avidity mean for my cancer type?
- Could this uptake reflect inflammation or infection rather than tumour activity?
- How does this compare to my previous scan, if I have had one?
- Does this finding change what you are recommending next?
- Do you need a biopsy or further imaging to interpret this result?
What do mild and intense avidity actually mean for my diagnosis?
Is mildly FDG avid reassuring?
Not automatically. Some cancers — including certain low-grade lymphomas and thyroid cancers — show only mild FDG uptake. Mild avidity can also mean chronic inflammation or healing tissue rather than cancer. The qualifier tells your team the degree of absorption, not whether the tissue is malignant. Your oncologist reads it alongside your diagnosis, biopsy results, and any earlier scans.
Can infections and inflammation look intensely avid?
Yes. Active infection, sarcoidosis, autoimmune flares, and recent surgery can all produce intense FDG uptake that resembles active tumour. This is a recognised limitation of PET imaging, noted in ESMO and EANM guidance on scan interpretation. A finding of intense avidity is always read alongside your clinical history, which is why a single report word rarely changes management on its own.
Why does the report use words instead of just the SUV number?
Radiologists use qualitative terms because SUV thresholds vary by cancer type, organ, and scanning centre. Many reports give both: the qualitative word and the SUV number. They are consistent — mildly avid means a relatively low SUV, intensely avid means a high one — but the exact cutoff is not fixed across all tumour types.
Does 'less avid than before' on a follow-up scan mean treatment is working?
Decreasing avidity is generally a favourable sign in cancers where PET is used to assess treatment response. Whether it represents a partial or complete response depends on criteria that differ by cancer type. Bring both scan reports to your appointment and ask your team what the change means for your plan.
Does 'FDG avid' in the report confirm cancer?
No. FDG avidity describes metabolic activity, not a diagnosis. A cancer diagnosis requires biopsy or highly characteristic imaging features in a known cancer type. The PET report is one piece of information that your oncologist and multidisciplinary team weigh alongside your clinical history and other investigations.
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Incidental Findings
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Common questions
Frequently asked questions
Does mildly FDG avid mean it is not cancer?
No. Mild avidity does not rule out cancer — some cancers show only low FDG uptake, including certain lymphomas, thyroid cancers, and mucinous tumours. It can also reflect inflammation or healing tissue with no cancer present. The qualifier describes how much tracer was absorbed, not whether the tissue is malignant. Your oncologist will explain what it means alongside your diagnosis and other results.
What is SUV, and does a high number always mean cancer?
SUV is the number that quantifies tracer uptake — a higher number means more absorption. A high SUV does not always mean cancer: active infection and inflammation produce high readings too. What counts as high depends on the organ and cancer type. Ask your oncologist or radiologist to explain what your specific SUV means in the context of your scan and clinical history.
Can the brain and heart show up as FDG avid even when they are healthy?
Yes. The brain and heart normally absorb FDG at high levels because they depend on glucose continuously. This is physiologic uptake — expected and normal. An experienced radiologist accounts for it and notes when uptake in those organs is abnormal. The liver is commonly used as a reference point when describing surrounding areas as mildly or intensely avid.
Can the qualifier on my scan change between two scans without any treatment?
Yes. Infection, inflammation, recent biopsy, steroid use, and blood sugar level at the time of injection can all affect FDG uptake between scans. PET preparation instructions are precise for this reason. Bring both reports to your appointment — a clinician who knows your full history can tell you whether a change is meaningful.
My report says 'intensely avid'. What should I do before my appointment?
Note which organ or area the finding is in and write down your questions. Do not try to interpret the finding from online case descriptions. Your oncologist and radiologist will weigh intense avidity alongside your full clinical picture. If you do not have an appointment soon, contact the team that arranged the scan and ask when you will be seen.
My report says 'physiologic FDG uptake' in one area. Is that a problem?
Physiologic means normal and expected. The brain, heart, kidneys and bladder absorb FDG as part of normal function, and the radiologist notes this to distinguish it from abnormal uptake. If an area is described as physiologic, the radiologist is telling your oncologist that this particular finding is not a concern. Your oncologist can confirm this when you review the report together.