Reading your report
'Suspicious for Malignancy': — How Certain Is That?
Reading the words 'suspicious for malignancy' on a scan report is frightening. But that phrase is not a diagnosis — it is a radiologist's careful way of flagging a finding that needs tissue testing to answer definitively.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Not a confirmed diagnosis — The radiologist is flagging a concern, not confirming cancer.
- Deliberate hedging — Radiologists use structured language to communicate exactly how certain — and how uncertain — they are.
- The words tell you the level of concern — 'Suspicious' and 'highly suspicious' sit at different points on a scale.
- Only tissue testing confirms it — A biopsy is what tells your team definitively whether a finding is cancer.
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'Suspicious for malignancy' means the radiologist has seen a finding with features associated with cancer, but cannot confirm it from imaging alone. It is a structured way of saying this needs a tissue sample to know for certain. It is not a cancer diagnosis.
What do the phrases on a scan report actually mean?
- Suspicious for malignancy
- The radiologist has seen a finding with features associated with cancer, but cannot confirm it from imaging alone. This phrase means further testing is needed — not that cancer is confirmed.
- Highly suspicious for malignancy
- The level of concern is higher than 'suspicious'. The features seen are strongly associated with cancer. Tissue confirmation is still required, but this phrase sits at the more urgent end of the scale.
- Cannot exclude malignancy
- The finding could be cancer, but could also be something else. The radiologist is saying: given what I can see, I cannot rule it out. This is generally a lower level of concern than 'suspicious for', but it still requires follow-up.
- Consistent with malignancy
- The appearance fits what cancer typically looks like on this scan type. This is a stronger phrase than 'suspicious' — the imaging fits a recognised pattern — but it is a description of appearance, not a confirmed tissue diagnosis.
- Indeterminate
- The scan cannot clearly characterise the finding as benign or concerning. More imaging, a different scan type, or tissue testing is usually needed before a clinical decision can be made.
- FDG-avid / metabolically active (PET scans)
- On a PET scan, this means the area is taking up the radioactive tracer more than surrounding tissue. Cancer cells are often metabolically active — but so is inflammation, infection, and some benign conditions, which is why further testing is needed.
Why don't scan reports give a straight yes or no?
Imaging shows structure and metabolic activity, not cell type. A CT or PET scan can show that a finding is there and describe its appearance, but cannot examine the cells themselves the way a laboratory can. That is the boundary between what imaging does and what pathology does.
Radiologists use hedging language deliberately because their job is to communicate exactly how certain they are — not to overstate what the scan can tell. A phrase like 'suspicious for malignancy' has a precise meaning in clinical reporting. It communicates the level of concern and what the findings suggest should happen next.
That uncertainty is about what the finding is — not about whether it deserves attention. Any phrase in this vocabulary means your oncologist will act on it.
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What actually confirms whether a finding is cancer?
A biopsy — a tissue sample taken from the finding — is what confirms a cancer diagnosis. The sample goes to a pathologist, who examines the cells directly and can say with certainty what type they are and whether they are cancerous.
The type of biopsy and how it is done depends on where the finding is. Some are done as a day procedure under local anaesthetic. Others may need image guidance or a brief admission. Your oncologist will explain which approach applies to your finding.
Until the tissue result is available, the scan report is a clinical prompt. It tells your team where to look — not what the final answer is.
What should I do now that I have the report?
- Do not read the scan report as a cancer diagnosis — it is a prompt for further investigation
- Ask your oncologist which phrase on the report applies to your finding and what it means for your situation
- Ask what the next investigation is and when it will be arranged
- Ask whether a biopsy is recommended and from which site
- Write down what you are told — these conversations are hard to recall accurately under stress
- Bring someone with you to the next appointment
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Explore 94 more Understanding Your PET-CT Report topics
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- 'Deauville Score' on a Lymphoma PET Report
- 'FDG Avid': What It Means on Your Report
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- Incidental Findings on a PET-CT Scan: What They Are
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Common questions
Frequently asked questions
Is 'suspicious for malignancy' the same as a cancer diagnosis?
No. A cancer diagnosis requires tissue — a biopsy sample examined by a pathologist. 'Suspicious for malignancy' tells your team that the imaging shows features associated with cancer and that tissue testing is the right next step. It is a call to act, not a conclusion. Your oncologist will explain what the phrase means for your specific finding and what needs to happen next.
What is the difference between 'suspicious' and 'highly suspicious' for malignancy?
Both phrases mean that imaging alone cannot confirm a diagnosis and that tissue testing is needed. 'Highly suspicious' sits at the more urgent end of the scale — the features seen are more strongly associated with cancer, and your team will typically move to confirm it more quickly. Neither phrase changes what is needed to confirm the finding; both lead to the same next step, which is tissue testing.
Can a PET scan be wrong about cancer?
A PET scan does not produce a right or wrong finding — it shows metabolic activity. An area that appears FDG-avid is showing increased tracer uptake, which cancer causes, but so can inflammation, infection, recent surgery, and some benign conditions. This is precisely why scan reports use careful language and why a tissue sample is needed to confirm what the activity represents. Your oncologist will interpret the scan in the context of your full clinical picture.
How long does a biopsy result take?
Most standard histology results are available within one to two weeks of the sample being taken. More detailed molecular testing — such as receptor profiling or genomic analysis — may take longer. Your team will tell you what testing is being done and give you a timeline. If you have not been told when to expect results, ask your oncologist's team directly so you are not waiting without a date.
Should I get a second opinion on my scan report?
A second radiology opinion is entirely reasonable, particularly when the phrasing feels unclear or the finding is ambiguous. What changes the clinical decision in most cases is the biopsy result, not a reread of the imaging. If you want a second opinion on your overall management plan once the tissue result is available, ask your oncologist to arrange one — most units support this.
Does 'suspicious for malignancy' mean treatment will start immediately?
No. Treatment begins only after a confirmed diagnosis, which requires a tissue result. The scan finding will prompt your team to arrange the next investigation — usually a biopsy — but not treatment itself. Acting quickly on the investigation matters, but no treatment decision is made before the diagnosis is confirmed. Ask your oncologist what the timeline looks like so you know what to expect at each stage.