Report interpretation
Low SUV but Still Cancer: — The PET-Negative Cancers
A low SUV on a PET scan is not reassurance if you have a cancer that does not depend on glucose. Several common cancers can be active and spreading while the PET report looks unremarkable. Knowing which ones — and what scan your team uses instead — is the question this page answers.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Not all cancers consume glucose — Prostate, renal cell and some others use different fuel sources, so FDG PET can miss them entirely.
- Slow-growing tumours blend in — Low-grade lymphoma and neuroendocrine tumours can look identical to normal tissue on FDG PET.
- A different tracer solves it — PSMA PET for prostate cancer and DOTATATE PET for neuroendocrine tumours are the main alternatives.
- SUV alone does not diagnose cancer — The number on your report is one input. Your oncologist interprets it alongside your clinical history and other imaging.
17+
Cancer Specialists
on Panel
on Panel
96.9%
Breast Cancer
Survival Rate*
Survival Rate*
15,000+
Patients
Treated
Treated
4.8★
Google Rating
(800+ reviews)
(800+ reviews)
A low SUV on a PET scan does not rule out cancer. Several cancers — including prostate, renal cell, mucinous tumours, low-grade lymphoma and well-differentiated neuroendocrine tumours — show low or absent FDG uptake even when active. SUV alone does not diagnose cancer. Your oncologist uses a more specific scan for these types.
Which cancers show low uptake on an FDG PET scan?
FDG PET works because most actively dividing cancer cells consume glucose at a high rate — a process called the Warburg effect. The SUV on your report measures the intensity of that uptake. Several cancers are consistent exceptions to this pattern.
Prostate cancer is the clearest example. Most prostate tumours rely on fatty acid metabolism rather than glucose, so FDG often shows little signal even when the disease is active or widespread. Clear cell renal carcinoma — the most common kidney cancer — also shows characteristically low FDG uptake for related metabolic reasons.
Well-differentiated neuroendocrine tumours and low-grade indolent lymphomas grow slowly enough that their glucose consumption is close to normal surrounding tissue, making them hard to distinguish on FDG PET. Mucinous tumours — found in some colorectal and ovarian cancers — have a gel-like composition with low cell density, which dilutes the FDG signal across the mass even when disease is present.
What scan is used when FDG PET is not the right tool?
- PSMA PET-CT (prostate cancer)
- Targets prostate-specific membrane antigen, a protein expressed abundantly on prostate cancer cells. Far more sensitive than FDG PET for detecting recurrence and staging. NCCN guidelines include it as a preferred imaging option for high-risk disease. At CION, coordinated through partner imaging centres.
- Ga-68 DOTATATE PET-CT (neuroendocrine tumours)
- Targets somatostatin receptors carried by well-differentiated NETs. ESMO and NCCN guidelines recommend it for staging and monitoring low-grade NETs where FDG is routinely negative. Also called a DOTANOC or DOTATOC scan depending on the tracer used at the centre.
- MRI (renal masses and soft-tissue lesions)
- Uses magnetic fields and does not depend on glucose metabolism at all. The preferred tool for characterising renal tumours, liver lesions and brain involvement where FDG PET would be unreliable.
- Contrast-enhanced CT (mucinous tumours)
- Detects structural changes — wall thickening, peritoneal deposits, fluid collections — that FDG misses in mucinous colorectal and ovarian cancers. Often used for baseline staging and follow-up in these types.
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Interventional Radiologist
Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Get a straight answer from a specialist
45 minutes, your reports reviewed, your questions answered in plain language.
What should you do if your report shows a low SUV?
A low or absent FDG uptake does not mean cancer is absent. It means that tissue is not consuming glucose at a high rate — which may be because the cancer type does not depend on glucose, because the tumour is slow-growing, or because there is genuinely no disease. Only your oncologist can tell you which, and only with your full clinical picture.
If your cancer is prostate, neuroendocrine, or mucinous in type and your report says 'no FDG-avid disease', ask whether a tracer better suited to your cancer has been planned. A negative FDG PET in these cancers is not a green light.
SUV alone does not diagnose cancer and does not by itself confirm remission. The number is one piece of information, read alongside clinical history, other imaging, and tumour markers.
Did you know?
In prostate cancer, PSMA PET-CT detects active disease in a substantial proportion of patients whose standard CT and bone scan found nothing — leading to a change in the planned treatment approach in many of those cases.
This pattern — one tracer seeing what FDG cannot — is why NCCN guidelines now list PSMA PET-CT as the preferred staging tool for high-risk prostate cancer.
Source: NCCN Guidelines: Prostate Cancer
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad — across 4 partner centres in Banjara Hills, Punjagutta, Himayatnagar and Narayanaguda. Indicative price, as of September 2026.
Explore 94 more Understanding Your PET-CT Report topics
SUV Values Explained
- Comparing SUV Between Two Scans: Is It Meaningful?
- Does a Higher SUV Mean a More Aggressive Cancer?
- Factors That Change Your SUV Reading
- High SUV but Not Cancer: When the Number Misleads
- Is My SUVmax of 4 High? Reading Your Specific Number
- Low SUV but Still Cancer: The PET-Negative Cancers
- SUV in Non-Cancer Conditions
- SUVmax, SUVmean and SUVpeak: What Is the Difference?
- What Is SUV on a PET Scan?
- What Is a Normal SUV Value?
- What SUV Value Indicates Cancer?
- Why Blood Sugar Changes Your SUV Result
- Why Did My SUV Go Down but Not to Zero?
- Why Did My SUV Go Up After Treatment?
False Positives, False Negatives & Pitfalls
- Bladder, Kidney and Ureter Activity on PET
- Bone Marrow Uptake After Growth Factor Injections
- Bowel Uptake: Normal, Inflammation or Something Else?
- Brown Fat Uptake: A Common Cause of Confusing Findings
- Does a Suspicious PET Finding Always Need a Biopsy?
- Getting a Second Read of Your PET-CT Images
- How Often Is a PET-CT Scan Wrong?
- Muscle Uptake After Exercise or Injections
- Thymic and Rebound Uptake in Younger Patients
- Uptake After Radiotherapy: Inflammation or Disease?
- Uptake at a Biopsy or Surgery Site
- What Causes a False Negative on a PET Scan?
- What Causes a False Positive on a PET Scan?
- What Happens If Two Scans Disagree?
- Which Cancers Do Not Show Well on PET-CT?
- Why the Brain Always Lights Up on PET
Incidental Findings
- A Second Unrelated Cancer Found on PET-CT
- An Incidental Bone Finding on PET-CT
- An Incidental Breast Finding on PET-CT
- An Incidental Kidney or Adrenal Finding
- An Incidental Liver Lesion on PET-CT
- An Incidental Lung Nodule Found on PET-CT
- An Incidental Prostate Finding on PET-CT
- An Incidental Thyroid Nodule on Your PET Scan
- Do All Incidental Findings Need Investigation?
- Focal Bowel Uptake: Could It Be a Polyp?
- Incidental Findings on a PET-CT Scan: What They Are
- Incidental Heart Findings on a Cancer PET Scan
- The Cost of Chasing an Incidental Finding
- What to Ask Your Doctor About an Incidental Finding
Infection, TB & Inflammation on PET
- Can Tuberculosis Look Like Cancer on a PET Scan?
- Dental Infection and Jaw Uptake on PET
- Fungal Infection and Abscess on PET-CT
- How Long Should You Wait After an Infection Before a PET Scan?
- If It Might Be Infection, What Test Comes Next?
- Inflammation After Injections, Vaccines and Cannulas
- Old Healed TB and Calcified Nodes on PET-CT
- PET-CT for Fever of Unknown Origin
- PET-CT for Suspected Infection in Implants and Prostheses
- PET-CT for Vasculitis and Inflammatory Conditions
- Pneumonia and Recent Chest Infection on PET
- Sarcoidosis on PET-CT: The Great Mimic
- TB or Cancer? How Doctors Tell Them Apart
- Thyroid Uptake on PET: Diffuse vs Focal
Reading Your Report: Core Terms
- 'Cannot Be Excluded' and Other Cautious Phrases
- 'Deauville Score' on a Lymphoma PET Report
- 'FDG Avid': What It Means on Your Report
- 'Hypermetabolic': What the Word Actually Means
- 'Hypometabolic' and 'Photopenic' Findings
- 'Impression' vs 'Findings': Which Section Should You Read?
- 'Interval Change' and 'Stable Since Previous Study'
- 'Krenning Score' on a DOTANOC or DOTATATE Report
- 'Lymphadenopathy' on Your PET Report
- 'Metabolically Active Disease': What It Tells You
- 'Metastasis' and 'Distant Spread' on Your Report
- 'Mildly FDG Avid' vs 'Intensely FDG Avid'
- 'No Abnormal FDG Uptake': Is That a Clear Scan?
- 'Physiological Uptake': Normal Areas That Always Light Up
- 'Residual Disease' vs 'Complete Metabolic Response'
- 'Sub-Centimetre Node' and Why Size Matters on PET
- 'Suspicious for Malignancy': How Certain Is That?
- How Long Does a PET-CT Report Take?
- How to Read Your PET-CT Report: A Section-by-Section Guide
- Should You Read Your Own PET-CT Report Before the Consult?
- TNM Staging on a PET-CT Report
- Why Your Report Mentions the Liver and Blood Pool
Response Assessment Scores & Criteria
- Complete Metabolic Response: What It Means
- Deauville Score 1 to 5: The Lymphoma Scale Explained
- End-of-Treatment PET Scan: What It Decides
- How Doctors Judge Whether Treatment Is Working on PET-CT
- Interim PET Scan During Chemotherapy: Why It Is Done
- Metabolic Response vs Size Response: Why They Differ
- PERCIST Criteria: How Metabolic Response Is Measured
- Partial Metabolic Response: Is That Good Enough?
- Progressive Metabolic Disease: What Happens Next
- RECIST vs PERCIST: Size vs Activity
- Stable Metabolic Disease: Good News or Bad?
- Tumour Flare and Pseudoprogression on PET
- What Is a Deauville 3 and Why Is It Ambiguous?
- Why the Scan Says One Thing and You Feel Another
Your next step
Talk to an oncologist about your scan
Your PET-CT report read by a senior oncologist, explained in plain language, with a free 45-minute consultation.
Common questions
Frequently asked questions
Does a low SUV mean the cancer has gone?
Not necessarily. For prostate cancer, neuroendocrine tumours and mucinous cancers, a low SUV is expected even when the disease is active, because these cancers do not depend on glucose. A low number in these types does not mean a good result. Your oncologist reads SUV alongside other imaging and tumour markers, never from the number alone.
My report says no FDG-avid disease. Is that good news?
It depends on the cancer type. In aggressive lymphoma or lung cancer, no FDG uptake after treatment is generally a sign of good response. In prostate cancer or a neuroendocrine tumour, FDG was often the wrong tool to begin with, and a separate scan using a different tracer may still show active disease. Ask your oncologist what that phrase means for your specific cancer type.
Why is my doctor ordering a PSMA scan instead of a PET scan?
PSMA PET-CT is a type of PET scan — it uses a tracer designed specifically for prostate cancer rather than FDG. Standard FDG PET is unreliable in most prostate cancers because they do not consume enough glucose to show up clearly. PSMA targets a protein on the surface of prostate cancer cells. NCCN lists it as the preferred imaging option for high-risk prostate cancer staging.
Which cancers are most likely to show a low SUV?
The most consistently low-uptake cancers are prostate, clear cell renal carcinoma, well-differentiated neuroendocrine tumours, low-grade indolent lymphomas and mucinous colorectal or ovarian cancers. Within these types, individual sites of disease can show variable uptake — especially if a cancer transforms to a more aggressive form. Every result needs interpretation by your oncologist in the context of your full clinical picture.
Why does kidney cancer not show up on a PET scan?
Clear cell renal carcinoma expresses an enzyme that allows FDG to leave the cell before it is detected, keeping the SUV low even when the tumour is present and growing. MRI and contrast CT are the standard tools for assessing renal masses. Your oncologist uses those rather than relying on FDG PET for a kidney tumour.
Is PSMA PET available in Hyderabad and Andhra Pradesh?
Yes. PSMA PET-CT and Ga-68 DOTATATE PET-CT are available at specialist imaging centres in Hyderabad and other cities across Telangana and Andhra Pradesh. At CION, these scans are coordinated through partner imaging centres. Ask your care team about the expected wait time and whether a referral is needed when the scan is ordered.