Reading Your Report
Metastasis and Distant Spread — What Your Report Is Telling You
Finding the word 'metastasis' or 'distant spread' in a scan report is one of the hardest moments in a cancer journey. This page explains what the terms mean, how certain a PET finding usually is, and what questions to bring to your oncologist.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- It means cancer cells have moved — Metastasis describes cancer cells that have reached a site other than where the cancer first started.
- PET findings are not always confirmed — Some lesions that appear on PET need a biopsy or follow-up scan before the picture is fully clear.
- This page explains terminology only — Your oncologist interprets your report. No web page — including this one — can tell you what your specific finding means for you.
- Treatment does not end here — The goal of treatment may change, but there are usually options. Your oncologist will explain what they are.
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Metastasis means cancer cells have moved from where the cancer first started to a different part of the body. On a PET scan report, a 'metastatic lesion' or 'distant spread' is a deposit of cancer cells detected at a new site. Your oncologist will explain what this means for your specific treatment plan.
What do the words on your report mean?
- Metastasis
- Cancer cells that have broken away from the original tumour, travelled through the blood or lymph system, and formed a new deposit elsewhere in the body. The plural is metastases.
- Metastatic lesion (secondary)
- A deposit of cancer cells found at a site other than where the cancer began. It is made of cells from the original cancer, not a new or separate cancer. Multiple deposits are called metastases or secondaries.
- Distant spread
- Radiologist language for spread to a different organ or body region from the primary tumour. Used interchangeably with metastasis on most reports.
- M1 / M0
- Staging shorthand in the summary of your report. M0 means no metastasis has been detected. M1 means at least one metastasis has been identified. Your oncologist will explain your full stage.
- FDG-avid lesion
- A site that absorbed more radioactive tracer than surrounding tissue during the PET scan. Cancer often does this, but so can inflammation or infection — which is why the radiologist's full clinical assessment, not the uptake alone, matters.
- Primary tumour
- The site where the cancer first began. Metastatic deposits are made of cells from this original tumour, even when they appear in a completely different organ.
What should you ask your oncologist about this finding?
- Which sites are involved, and how many lesions were found?
- Is this finding confirmed, or does it need a biopsy or follow-up scan first?
- How does this change my stage, and what does that mean in practice?
- What are the treatment options now, and what is each aiming to achieve?
- Has the goal of treatment changed from removing the cancer to controlling it?
- Are there clinical trials I should know about?
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How certain is a PET finding of metastasis?
PET scans are sensitive — they detect raised metabolic activity in cells, which is a feature of cancer. But sensitivity is not the same as certainty. Areas of inflammation and infection can also produce increased tracer uptake, and the same-looking deposit can mean different things depending on its location, size, and your full clinical history.
Radiologists signal their confidence through language. 'Consistent with metastasis' or 'in keeping with distant spread' carries more weight than 'cannot exclude' or 'further assessment recommended', which flag that the finding is not yet confirmed.
Your oncologist will decide whether the PET finding is clear enough to act on, or whether a biopsy or additional imaging is needed first. Do not adjust your understanding of your situation based on the report alone — that conversation comes first.
What do families ask most after seeing this word?
Does metastasis mean the cancer cannot be treated?
No. Metastasis means treatment has become more complex, and in most cases the goal shifts from removing the cancer entirely to controlling it and maintaining quality of life. Many people continue treatment for extended periods. What is available to you depends on your cancer type, the sites involved, your overall health, and how the cancer has behaved — none of which this page can answer. Your oncologist will explain the options for your specific situation.
Can a metastasis be removed surgically?
Sometimes, in carefully selected patients with a small number of metastases — particularly in the liver or lungs — surgery or local radiation to individual lesions is part of the plan. This depends on the number and location of lesions, the cancer type, and your overall fitness. It is not an option for everyone, and a multidisciplinary team would assess whether it applies to you. Ask your oncologist whether local treatment of any individual lesion is worth discussing.
The report says 'suspicious for metastasis' — does that mean they are not sure?
Yes. 'Suspicious for' or 'possible metastasis' signals that the finding is concerning but not confirmed. The next step is usually a biopsy of the lesion, additional imaging, or a clinical review to put the finding in context. Your oncologist will tell you whether more investigation is needed before any treatment decision is made. Acting on an unconfirmed finding without that step would be premature, and that is why the exact language on the report matters.
How did the cancer spread if the original tumour was removed?
Cancer cells can enter the bloodstream or lymph system before, during, or after surgery — sometimes long before they become detectable. Removing the primary tumour reduces the source of new cells but cannot retrieve cells that had already moved. This is not a surgical failure. It helps explain why systemic treatments — ones that travel through the body — are often part of the plan alongside, or after, local treatment.
Should we get a second opinion on this report?
A second opinion is always reasonable for a significant finding, and asking for one is not a sign of distrust. You can ask your oncologist to refer you for a second radiological read, or seek a review at another centre. Bring the original PET images and the full written report, not just a summary. A second opinion is most useful when the finding is ambiguous, when it will substantially change your treatment, or when you have doubts about the recommended path forward.
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Explore 94 more Understanding Your PET-CT Report topics
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
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
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
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?
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Common questions
Frequently asked questions
What is the difference between metastasis and recurrence?
Recurrence means the cancer has come back after a period of remission or apparent clearance — either at the original site or at a new one. Metastasis specifically means spread to a site other than where the cancer started. A cancer returning in a distant organ is both a recurrence and a metastasis. Your oncologist will use whichever term most accurately describes your situation, and the treatment approach follows from that.
Does a PET scan show all metastases in the body?
PET covers the whole body in one scan and is very sensitive, but no scan sees everything. Very small lesions and certain locations — including the brain, which often needs a dedicated MRI — may not appear clearly. Your oncologist may order additional imaging to complete the picture. The PET report is one part of the assessment, not the only one.
Will I need another biopsy if metastasis is found on PET?
Sometimes. If the diagnosis is already confirmed and the PET finding clearly fits with spread, a repeat biopsy may not be needed before treatment starts. In other cases — particularly when the finding is ambiguous, or when targeted therapy is being considered and the tumour's molecular profile matters — a biopsy of the new site may be required. Ask your oncologist whether a biopsy is part of the next step and why.
What does 'in keeping with metastatic disease' mean on a report?
'In keeping with' means the radiologist considers the finding consistent with spread from your known cancer, based on its location, appearance, and tracer uptake pattern. It is confident language. It is not a confirmed tissue diagnosis, but in someone with a known cancer it is taken seriously. Your oncologist will decide whether to treat on this basis or confirm with a biopsy first.
Is the treatment for metastatic cancer different from what I had before?
Often it overlaps, but it may not be identical. Treatment for metastatic disease aims to reach cancer cells throughout the body, so systemic treatments — chemotherapy, targeted therapy, immunotherapy, or hormone therapy — are commonly involved, depending on your cancer type. What changes most is the intent: the goal is typically to control the disease and maintain quality of life. Your oncologist will explain what this means for you.
Is immunotherapy available at CION for metastatic cancer?
Immunotherapy is available at CION centres and is given as day care. Whether it applies to your metastatic cancer depends on your cancer type and biomarker testing — not all metastatic cancers respond to it. PET-CT and other response-assessment scans are coordinated with partner imaging centres. CION does not provide CAR-T or cell therapy; if that is being considered, you would be referred to a centre that offers it.