Incidental Findings
An Incidental Liver Lesion — on PET-CT: What the Scan Found
A liver lesion on your PET-CT was not what the scan was sent to find. Most liver lesions found by chance are benign. What matters most is whether it takes up FDG — and whether its appearance on the CT matches a known benign pattern.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Found by chance — The scan was looking elsewhere. The lesion appeared in the liver without any symptoms prompting the investigation.
- FDG uptake is the key clue — Common benign lesions — haemangiomas and cysts — do not take up FDG. That absence changes what happens next.
- Not the same as a diagnosis — Finding a lesion is the beginning of an investigation, not the end. Your team needs more information before they can say what it is.
- MRI is usually next — If the PET-CT cannot characterise the lesion fully, an MRI gives a much more detailed picture of what it is.
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A liver lesion found on PET-CT is a spot your scan was not looking for. The most useful clue is whether it takes up FDG. Cysts and haemangiomas — the most common benign causes — do not. If a lesion shows FDG uptake, your team will arrange further imaging, usually an MRI, to find out what it is.
At CION, a whole-body PET-CT starts from Rs 10,499 — among the lowest published prices in Hyderabad. Indicative price, as of September 2026.
What are the most common causes of a liver lesion found on PET-CT?
Most liver lesions found by chance are benign. The two most common are simple cysts — fluid-filled sacs — and haemangiomas, which are clusters of small blood vessels. Both are very common in people who have never had any liver problem.
Neither cysts nor haemangiomas take up FDG. A lesion with no FDG activity and an appearance on the CT portion that matches one of these patterns is unlikely to be cancer and may not need any further imaging at all.
A lesion that does show FDG uptake needs further investigation. Uptake alone does not confirm cancer — some benign and inflammatory conditions also show uptake — but it means your team needs a clearer picture before reaching any conclusion.
What do the terms in my PET-CT report mean?
- Lesion
- An abnormal area seen on imaging. The word describes a spot — not what the spot is.
- Incidental finding
- Something the scan found that it was not sent to look for. It may need follow-up, or it may turn out to be nothing.
- FDG
- A radioactive sugar injected before a PET scan. Cancer cells tend to take it up more than normal tissue, which is why they appear brighter on the scan.
- Haemangioma
- A harmless cluster of blood vessels in the liver. Very common in the general population. Does not take up FDG on PET-CT.
- Simple cyst
- A fluid-filled sac in the liver. Also very common, also benign. Does not take up FDG on PET-CT.
- Further characterisation needed
- The radiologist cannot say from this scan alone what the lesion is. A different type of imaging — usually an MRI — will give a clearer answer.
Does FDG uptake on PET-CT tell you whether a lesion is cancer?
No — but it is the most useful clue the scan offers. A lesion with no FDG uptake and a typical benign appearance can often be explained without further imaging.
A lesion that does take up FDG will be investigated further. An MRI of the liver gives much more detail about a lesion's structure and blood supply than PET-CT, and is the preferred investigation when the picture is not clear.
PET-CT is designed to detect metabolic activity across the whole body. It is not designed to characterise a small spot in the liver in detail — that is what MRI is for.
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PET-CT Centre — Punjagutta
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What should you tell your team at your next appointment?
- Tell your oncologist about any previous scans of your abdomen or liver — ultrasound, CT, or MRI — even if they were years ago.
- If hepatitis B, hepatitis C, or heavy alcohol use is part of your history, tell your team. It changes how a liver lesion is investigated.
- Ask whether the lesion has FDG uptake, or whether it was found only on the CT portion of the scan.
- Ask what the next imaging will be, when it will be arranged, and when the result will be discussed with you.
- If a liver lesion was noted on an earlier scan and no follow-up was arranged, bring that report to the appointment.
Did you know?
Haemangiomas are among the most frequently found incidental liver lesions in people having cross-sectional imaging for any reason — including people with no history of liver disease.
They do not take up FDG. That single characteristic means they can often be identified without a biopsy.
Source: European Association for the Study of the Liver (EASL) Clinical Practice Guidelines
What do families want to know when a liver lesion is found?
Could this mean the cancer has spread to the liver?
An incidental finding does not automatically mean spread. Most liver lesions found by chance — even in people with a cancer history — are benign. Your team will look at whether the lesion takes up FDG and whether its appearance on the CT matches a known benign pattern. If neither gives a clear answer, an MRI will characterise it properly. Only after that investigation can your team tell you what the lesion is.
Will I need a biopsy?
Many liver lesions can be characterised without a biopsy. An MRI gives detailed information about a lesion's blood supply and internal structure, and for haemangiomas and cysts the imaging appearance is usually enough to reach a conclusion. A biopsy is considered when imaging does not give a clear answer, or when the lesion does not match a benign pattern. Your radiologist and oncologist will make that decision together.
Why was this not found on my previous scans?
PET-CT covers the whole body at a level of detail that earlier scans — particularly ultrasounds or CT scans done for a different purpose — may not have achieved for the liver. Small lesions can be present for years without appearing on one type of imaging. It does not necessarily mean the lesion has grown recently or changed since your last scan.
Should I be more worried because I have cancer?
Having cancer elsewhere does not change what a liver lesion is — only the investigation changes, because your team will want to rule out spread more carefully than they might in someone without a cancer history. Most liver lesions found incidentally in people with cancer are still benign. The further imaging is precautionary, not a conclusion. Ask your oncologist to explain what they are looking for and what the next step will be.
What if my team decides to watch it rather than scan again soon?
Some lesions — particularly those with no FDG uptake and a typical benign appearance — are followed with periodic imaging rather than investigated immediately. That is a clinical decision based on the lesion's appearance, your overall situation, and whether there is a comparison scan from before. If you are unsure what the plan is, ask your team to explain it clearly and write down the next step for you.
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
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
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
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
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 does 'liver lesion' mean on a PET-CT report?
It means the scan found an abnormal area in your liver that was not the reason for the scan. The word 'lesion' describes a spot — not what the spot is. It can mean a cyst, a haemangioma, a benign growth, or something that needs further investigation. Your team will look at whether it takes up FDG and whether its shape gives any clues, then decide what, if anything, needs to happen next.
Is a liver lesion on PET-CT always cancer?
No. The most common liver lesions found by chance are benign — cysts and haemangiomas are both very common, and neither is cancer. What makes the investigation important is working out which type of lesion this is. A lesion with no FDG uptake and a typical appearance on the CT is unlikely to be cancer. A lesion with uptake needs further imaging before your team can reach any conclusion.
What is the difference between a haemangioma and a liver metastasis on PET-CT?
The key difference on PET-CT is FDG uptake. A haemangioma does not take up FDG — it appears on the CT portion of the scan but is dark or absent on the PET portion. A liver metastasis typically does take up FDG and appears bright. The shape and density of the lesion on CT also help distinguish them. When the appearance is not clear enough to be certain, an MRI is arranged to look in more detail.
Why is an MRI better than PET-CT for characterising a liver lesion?
PET-CT is designed to detect metabolic activity across the whole body — it is good at its job, but that job is not to characterise a small area in fine detail. MRI produces detailed images of a lesion's internal structure, fluid content, and blood supply. Those features are often enough to distinguish a benign lesion from something that needs further attention, without a biopsy. Your radiologist will choose the appropriate MRI sequences for the specific question being asked.
How common is it to find something unexpected on a PET-CT?
Incidental findings on PET-CT are not unusual — the scan covers the whole body, so it will sometimes find things in organs it was not specifically asked to look at. Liver lesions are among the more common incidental findings. The majority, when investigated properly, turn out to be benign. The important thing is not to draw conclusions while the investigation is underway, and to ask your team what they expect the next step to show.
Should I contact my oncologist before my next scheduled appointment?
If your next appointment is more than a few days away and you are worried, it is reasonable to call your oncologist's office and ask whether this finding needs to be assessed sooner. Your team can tell you whether the lesion looked clearly benign on initial review and what the plan is. If you have no symptoms related to your liver — such as pain, yellowing of the skin or eyes, or unexplained weight loss — it is unlikely to be urgent. Your team's guidance takes precedence over any general advice.