Lymphoma & Blood Cancer
PET-CT for Lymphoma: — Why This Scan Changes Treatment
In lymphoma, a PET-CT scan does more than show where the cancer is. It tells your team whether the cancer cells are alive and active — and in several lymphoma types, the result mid-treatment changes what you receive next.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Activity, not just size — PET-CT detects metabolic activity in cancer cells, not only their size — which is why it can show a response before the tumour has had time to shrink.
- The scan that changes the plan — In Hodgkin lymphoma and DLBCL, the interim PET result is used to adjust your treatment while it is still under way.
- A language of its own — Your report uses terms like Deauville score and CMR. These are the standard framework haemato-oncologists use — this page explains what each one means.
- Multiple scans, one comparison point — You will likely have three or more PET-CTs across your treatment. Each is read against your baseline — the change is what matters, not any single result in isolation.
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PET-CT is the standard imaging tool in lymphoma because it shows whether cancer cells are metabolically active — not just their size. In Hodgkin lymphoma and diffuse large B-cell lymphoma, the result after your first two cycles of treatment routinely changes the plan. No other cancer uses the scan this way as standard practice.
CION offers PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city, with no hidden charges. Indicative price, as of September 2026.
How does PET-CT differ from a CT scan alone in lymphoma?
| CT scan alone | PET-CT | |
|---|---|---|
| What it measures | Size and shape of lymph nodes and organs | Metabolic activity — whether cancer cells are alive and taking up glucose |
| Can show response before tumour shrinks | No — size changes take weeks | Yes — activity drops before size reduces |
| Used to guide mid-treatment decisions | Not used for this in standard protocols | Standard in Hodgkin lymphoma and DLBCL |
| Distinguishes scar tissue from active disease | Cannot reliably separate the two | Can separate residual scar from living tumour |
| Framework for confirming remission | Limited — scarring can mimic residual tumour | Lugano criteria are PET-based; preferred method |
What scans will you have, and when?
- Baseline PET-CT before treatment starts — maps disease location and activity, the reference point every later scan is compared against.
- Interim PET-CT after two cycles — shows whether the lymphoma is responding while treatment can still be changed.
- End-of-treatment PET-CT — used to confirm whether complete metabolic response has been achieved.
- Surveillance PET-CT only if new symptoms appear or relapse is suspected — not routine in most remission protocols.
- Each scan is read against your baseline. The change over time is what your team is assessing, not any single result alone.
Why does PET-CT matter more in lymphoma than in other cancers?
Lymphoma cells are typically metabolically active — they take up the glucose-like tracer used in PET at a rate that makes them clearly visible. This is one of the reasons lymphoma is among the cancers where PET-CT gives the most clinical information.
The scan allows your team to see whether the disease is responding before the tumour has had time to shrink. In some lymphoma types, a strong early response visible on PET leads to a less intensive continuation; a poor response leads to escalation.
This is what makes PET-directed therapy possible. In a small number of cancer types, the imaging is built into the treatment algorithm — not just used to observe it. Lymphoma is the clearest example of this in current clinical practice.
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.
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What do the terms in your PET-CT report mean?
- FDG
- Fluorodeoxyglucose — a mildly radioactive, glucose-like tracer injected before the scan. Cancer cells that are actively dividing take it up, making them visible on the PET image.
- FDG-avid
- A site is FDG-avid when it is taking up the tracer actively. Your report may describe lesions as avid or non-avid — this indicates whether PET detected activity at that location.
- SUVmax
- Standardised uptake value — a number reflecting how intensely an area is taking up the tracer. It is one data point read in context by your reporting physician, not a standalone verdict.
- Deauville score
- A five-point scale comparing uptake in assessed areas against reference points in the body. Your haemato-oncologist interprets what your score means for your treatment — the number is not self-explanatory without that context.
- Complete metabolic response (CMR)
- No detectable FDG-avid disease on the scan, assessed using Lugano criteria. Your team will explain what CMR means for your ongoing care and monitoring.
- Partial metabolic response (PMR)
- A reduction in metabolic activity but not full clearance. Your team will explain what this means for the next step in your treatment.
- Lugano criteria
- The international framework haemato-oncologists use to classify PET-CT responses in lymphoma. Your report is written within this framework.
Questions about lymphoma PET-CT that need a longer answer
How many PET-CT scans will I need in total?
Most patients have three scans across their treatment journey: baseline, interim, and end-of-treatment. Whether you have further scans during surveillance depends on your lymphoma type and how your disease behaves. Your haemato-oncologist will give you the planned schedule at the start of treatment, and that plan may be adjusted as your response unfolds. If you are unsure why a particular scan is being requested, ask — each one should have a clear clinical reason.
My report gives me a Deauville score. What does my score mean?
The Deauville score is the standard language haemato-oncologists and nuclear medicine physicians use to communicate PET results in lymphoma. The five points on the scale correspond to levels of uptake compared with specific reference structures in the body. What your score means for your treatment depends on your lymphoma type, the stage of treatment you are at, and the protocol your team is following. Please do not interpret the number on its own — ask your haemato-oncologist to explain your result in the context of your full picture.
Why do I need a scan during treatment, not just at the end?
In Hodgkin lymphoma and diffuse large B-cell lymphoma, the interim PET result carries information that is only useful while treatment can still be changed. If the lymphoma is responding very well, some protocols allow a less intensive continuation. If the response is insufficient, the approach can be escalated. Waiting until the end of treatment closes that window. The interim scan is one of the reasons outcomes in Hodgkin lymphoma have improved steadily over the past two decades, according to ESMO.
My scan showed residual activity. Does that mean the treatment has not worked?
Not necessarily. Some residual uptake reflects inflammation or healing tissue rather than living tumour. The Deauville scale and the Lugano criteria your report uses are designed specifically to distinguish meaningful activity from background — they compare the residual signal against reference points rather than treating any uptake as disease. Your haemato-oncologist will tell you what the residual finding means for your care, whether further imaging or a biopsy is needed, and what happens next. Do not interpret the result before that conversation.
Can I have a PET-CT if I am also diabetic?
Yes, but your team needs to know in advance. The FDG tracer is glucose-based, so blood sugar levels affect how clearly the scan images. Diabetic patients are given specific preparation instructions around fasting and medication timing. Tell the booking team about your diabetes when you schedule — they will tailor your preparation accordingly. Arrive fasted as instructed and bring your full medication list on the day of the scan.
Will I have my scans at the same centre every time?
Your team will aim for consistency, because minor differences between scanners can affect the numbers in your report. At CION, PET-CT scans are coordinated with partner imaging centres. If you need to use a different centre for any reason, tell your haemato-oncologist — they will take this into account when comparing results. Consistency in how you prepare — fasting, activity levels, timing — also matters, and your team will advise you on this each time.
Did you know?
In Hodgkin lymphoma, treatment protocols in which the interim PET result guides the number of chemotherapy cycles are now part of standard guidelines from both ESMO and NCCN.
The scan is not just a check on the treatment — it is part of the treatment algorithm itself.
Source: ESMO Clinical Practice Guidelines: Hodgkin Lymphoma; NCCN Guidelines: Hodgkin Lymphoma
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.
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Common questions
Frequently asked questions
What is PET-CT actually measuring in a lymphoma scan?
PET-CT combines two scans. The CT part shows the size and position of lymph nodes and organs. The PET part uses FDG — a mildly radioactive glucose-like tracer — to show which areas are metabolically active. Lymphoma cells take up FDG in proportion to how actively they are dividing. The combined image shows not just where disease is located but whether those cells are alive. This is what makes PET-CT more informative than CT alone in lymphoma.
Is the radiation from repeated PET-CT scans harmful?
PET-CT involves radiation from both the CT component and the FDG tracer. The dose from each scan is low in the context of medical imaging. Your team considers the total number of scans against the clinical value of each one — in lymphoma, the information from baseline, interim, and end-of-treatment scans is considered to justify the exposure. If you are concerned about cumulative radiation, ask your haemato-oncologist to explain the rationale for each planned scan.
How long will I wait for my PET-CT result?
Reporting times vary between centres. A lymphoma PET-CT is usually read by a nuclear medicine physician and then reviewed by your haemato-oncologist before your next appointment. Ask at the time of booking how long the turnaround is at your specific centre, and confirm when you will discuss the result with your team. Knowing the timeline in advance makes the waiting period easier to manage.
How do I prepare for a PET-CT scan?
You will be asked to fast for several hours before the scan — usually four to six hours — to lower your baseline blood sugar and improve image quality. Avoid strenuous exercise in the 24 hours before, as muscle uptake of FDG can interfere with the images. Wear comfortable clothing without metal. If you are diabetic, tell the booking team when you schedule. Your imaging centre will give you a full preparation sheet at the time of booking.
My doctor mentioned response-adapted therapy. What does that mean?
Response-adapted therapy means your treatment plan is adjusted based on what your interim PET-CT shows. If the disease is responding very well, some protocols allow treatment to be de-escalated — fewer cycles or a less intensive regimen — reducing side effects. If the response is not sufficient, the protocol may be intensified. The interim PET-CT result is the decision point. Your haemato-oncologist will explain what your interim result means for your specific protocol.
Does a complete metabolic response on PET mean the cancer is gone?
A complete metabolic response — CMR — means the scan shows no detectable FDG-avid disease at that point in time. It is a significant and positive finding. It is not a guarantee that the disease will not return, and your haemato-oncologist will explain what CMR means for your monitoring and ongoing care. Your long-term outlook is discussed based on your full clinical picture, not any single scan result.