Understanding your scan report
Why the Scan Says One Thing — and You Feel Another
You feel well — or better than before — and then the scan report arrives and the words suggest the opposite. This is more common than most people expect, and it is not automatically a sign that something has been missed. This page explains what the disagreement usually means and what your oncologist considers when the two do not match.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- Scans and symptoms measure different things — A PET scan measures metabolic activity in tissue. How you feel reflects your whole body's response — including treatment side effects — not just the tumour.
- Pseudo-progression is a recognised pattern — Some treatments cause a scan to appear worse before it improves. It is seen most often with immunotherapy and is not the same as treatment failure.
- Both results matter to your team — Scan findings typically guide treatment decisions. Your symptoms add context the scan cannot show. Your oncologist weighs both.
- Your result needs individual interpretation — The terms on a report are population-level criteria. What they mean for your specific result is a question for your treating oncologist.
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)
Yes, a scan and symptoms can genuinely point in opposite directions. A PET scan measures metabolic activity in tissue; how you feel measures something else entirely. Your oncologist considers both, and when they disagree, the scan typically guides treatment decisions — but your symptoms are evidence too, and your team needs to hear about them.
Can a scan and symptoms really point in opposite directions?
Yes, and it is more common than most people expect.
A PET scan measures how actively cells are taking up glucose. Some cancer cells use a great deal of it, which is why they show brightly on the scan. But inflammation in healing tissue and the side effects of treatment also use glucose, and they can appear on the scan in a way that looks like active disease.
This is why someone can genuinely feel better while a scan looks worse — and why a stable or improving scan can come alongside someone who is exhausted and uncomfortable from treatment. Neither experience is wrong. They are measuring different things.
What do the words on your scan report actually mean?
- Progressive disease (PD)
- The scan shows the cancer is measurably larger or more metabolically active than the previous scan. This does not automatically mean your oncologist will change treatment today — the decision depends on your full clinical picture, the size of the change, and what options exist.
- Stable disease (SD)
- The cancer has not changed enough to be classified as either better or worse. For some cancers and some treatments, stable disease sustained across multiple scans is a meaningful outcome in its own right.
- Partial response (PR)
- The cancer has shrunk or become measurably less active since the previous scan. The threshold for what counts is set by standardised criteria — RECIST for CT-measured tumour size, PERCIST for PET-measured metabolic activity. Your report will state which was applied.
- Complete response (CR)
- No cancer is detectable on this scan. This means the disease has fallen below what imaging can find — not that the cancer is absent at a cellular level. Your oncologist will tell you what a complete response means for your specific situation and what monitoring follows.
- Pseudo-progression
- A pattern where the scan appears to worsen in the early weeks of treatment before later improving. It is most often seen with checkpoint inhibitor immunotherapy and is recognised in guidance from ASCO and ESMO. It can look identical to true progression on a single scan, and a repeat scan — rather than an immediate treatment change — is usually the next step when it is suspected.
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.
You do not have to work this out alone
A 45-minute consultation with a specialist who treats this every week.
Which does your team trust more — the scan or how you feel?
Your oncologist uses both, because they are measuring different things.
Scan findings are objective. They show what imaging can detect in tissue at one moment. How you feel reflects your whole body's response — the tumour's behaviour, treatment side effects, and your baseline health — which are not the same thing.
Treatment decisions are typically guided by scan findings, because imaging can detect changes before your body registers them. But your symptoms are evidence too. Tell your team how you have felt across the whole interval since the last scan, not just how you feel sitting in the clinic today. A meaningful gap between a reassuring scan and a difficult lived experience is something your oncologist needs to know about.
What should you tell your team at your post-scan appointment?
- How you have felt since the last scan — better, worse, or the same, and in what specific way
- Any new symptom that has appeared since the previous scan
- Whether your appetite, weight, or energy level has changed
- Any pain that is new, has changed in character, or has worsened
- Any supplement, herbal preparation, or traditional remedy you have started since the last scan
- How long any change in how you feel has lasted — days, weeks, or ongoing
What are the situations where a scan and symptoms commonly disagree?
My oncologist says this might be pseudo-progression. How do we tell which it is?
Pseudo-progression cannot be identified from a single scan. Your oncologist combines the scan finding with your symptoms, the treatment you are on, how long you have been on it, and often a repeat scan a few weeks later. It is most commonly discussed in patients on checkpoint inhibitor immunotherapy. Ask your oncologist what they are looking for on the next scan and at what point they would conclude that treatment has stopped working.
The scan looks better but I feel much worse from side effects. What happens now?
Feeling worse while the scan improves usually reflects treatment side effects rather than disease progression. Fatigue, nausea, immune reactions, and treatment-related inflammation can all cause significant discomfort while the cancer is responding. Some of these side effects need treatment in their own right. Tell your oncologist exactly what you are experiencing — which symptoms, how long they have lasted, and how they are affecting your daily life.
Can I ask for the scan to be repeated sooner if the result does not feel right?
Yes, and it is a reasonable question to raise. Repeating a scan sooner makes clinical sense when there is genuine uncertainty about whether a finding represents true progression or a pattern like pseudo-progression, when new symptoms appear that do not fit the current result, or when a clinical decision cannot wait for the next scheduled scan. Ask your oncologist what they would be looking for and what the result would need to show to change the plan.
The scan is stable but my oncologist is talking about changing treatment. Why?
Stable disease is not always the goal. For some cancers, the aim is measurable shrinkage, and stable across several scans may mean the treatment has reached the limit of what it can achieve. Your oncologist may also be watching a pattern across scans rather than a single result, or considering whether a different treatment offers more. Ask what response they were aiming for and what the current pattern tells them about the options ahead.
Book a PET-CT at CION from Rs 10,499 — among the lowest published prices in Hyderabad — with an oncologist-reviewed report and a free Rs 950 consultation, across 4 partner centres. Indicative price, as of September 2026.
Explore 94 more Understanding Your PET-CT Report topics
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
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
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?
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
Why does my report say progressive disease if I feel completely normal?
Progressive disease means the scan detected measurable growth or increased activity compared to the previous scan — not that the cancer has become symptomatic. Imaging can detect changes before you feel them. How you feel is important information for your team, but the scan result is what drives the formal response assessment. Your oncologist will tell you what this specific finding means for your treatment plan.
What is the difference between a scan looking worse and my cancer getting worse?
They are not always the same thing. A scan reflects what imaging can detect at one moment, and that includes inflammation, healing tissue, and in some situations pseudo-progression alongside genuine tumour growth. Your oncologist interprets the scan in the context of your history, your symptoms, and the pattern across previous scans. A single worsening scan is one piece of information, not a standalone verdict.
Is it safe to wait when pseudo-progression is suspected instead of changing treatment?
Your oncologist will not simply wait without a plan. The usual approach is a repeat scan after a defined interval alongside close clinical monitoring. Pseudo-progression and true progression can look identical on a single scan — the difference typically becomes clear on the next one. Your oncologist will tell you exactly what they are watching for and at what point they would act on the finding.
Will a worsening scan always mean my treatment changes?
Not automatically. Your oncologist will consider how much has changed, whether the finding could represent something other than true progression, what your full clinical picture shows, and what alternatives exist. Some findings are observed across the next scan before a decision is made. Ask your oncologist what they are deciding and on what timeline, so you know what to expect.
How many scans does my oncologist look at before deciding a treatment is not working?
There is no fixed number. Response assessment is a pattern read across time, not a verdict from a single scan. Your oncologist watches the direction of change, the size of that change, and your clinical symptoms together. Ask at each review what trend they are seeing and what that tells them about the plan ahead.
How do I raise it with my oncologist when the scan does not match how I am doing?
Say it directly: the scan result and how you feel are not matching up for you, and you would like them to explain what they are looking at and why. You are giving your team useful information, not challenging their judgement. If the explanation still does not account for your experience, asking for a second clinical opinion is entirely reasonable.