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Diagnosis accuracy

When Your Scan and Biopsy — Give Different Answers

Two tests pointing in opposite directions is frightening. It does not mean the diagnosis is lost — it means your team has found a discrepancy that needs to be resolved before treatment can proceed safely.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Not a mistake — a signal — Discordant results are a recognised pattern in oncology. Your team knows how to work through them.
  • Neither test is automatically right — A scan and a biopsy measure different things. Disagreement tells your team something useful.
  • Further steps are standard — NCCN and ESMO guidance is clear that discordance requires review, not a forced choice between two results.
  • Delays have a purpose — Resolving the discrepancy first protects you from treatment built on the wrong information.
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When a scan and biopsy give different answers, your team does not simply choose one result and move on. The disagreement itself is clinically significant and triggers a formal review. Which finding is trusted depends on the cancer type, the tests involved, and how large the gap is between the two results.

What do these medical words mean?

Discordant result
When two tests examining the same tissue or area give conflicting information. Neither is automatically the correct one.
Concordant result
When different tests agree with each other. Concordance increases confidence that the finding reflects what is genuinely present.
Sampling error
When the biopsy needle takes tissue from beside the suspicious area rather than within it. The sample is processed correctly, but it does not represent the lesion the scan detected.
False negative
A result that reports normal when abnormal tissue may be present. Sampling error is the most common biopsy cause.
False positive
A result that flags an abnormality when the tissue is not cancerous. Scans can do this when inflammation or infection looks similar to cancer on imaging.

Why do a scan and a biopsy give different results?

Scans and biopsies are not doing the same job. A PET-CT or MRI measures anatomy and metabolic activity across a wide area. A biopsy examines a small sample of cells under a microscope. Each is a different kind of evidence.

The most common reason they disagree is sampling error. When a tumour is irregular or contains different cell types in different areas, the needle may take tissue from a region that looks different from the part the scan flagged.

Scans can also flag areas that turn out not to be cancerous. Tuberculosis, sarcoidosis, and post-treatment inflammatory changes can all produce appearances on PET-CT that resemble active disease — a recognised cause of false-positive findings in India, acknowledged in ESMO guidance for endemic regions.

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Which result does your oncologist trust when they disagree?

There is no single rule. The answer depends on the cancer type, how suspicious the scan appearances are, and whether the biopsy site was technically adequate.

For some cancers, a negative biopsy against a strongly suspicious scan is treated as inconclusive, not reassuring. NCCN and ESMO guidance in several tumour types specifically recommends repeat sampling rather than accepting a negative biopsy against a positive scan.

Your oncologist may convene a multidisciplinary team — oncologists, radiologists, and pathologists reviewing the same case together — before deciding which direction to take. This is not indecision. It is the system working as intended.

If you are unsure why a particular result is being trusted over another, ask your oncologist to explain the reasoning. A clear answer to that question is reasonable to expect.

What happens next when results do not agree?

Is a repeat biopsy always the next step?

Not always, but it is often the most direct path. Whether a repeat biopsy is needed depends on how strongly the scan suggests malignancy, whether the original sample was technically adequate, and whether the site can be safely re-sampled. Some discordant results are resolved by having a second pathologist review the original biopsy slides rather than by taking new tissue. Others are resolved by repeating the imaging after a short interval to see whether the area has changed. Your team will tell you which path applies to your situation.

Could the biopsy have been taken from the wrong place?

Yes, and this is one of the first things your team will check. Biopsy guidance uses ultrasound or CT to direct the needle, but tumours that vary across different regions — heterogeneous tumours — can still be sampled in a way that misses the most abnormal area. A technically adequate biopsy of the wrong part of a mass will be reported as normal. Reviewing the imaging done at the time of the biopsy alongside the scan that raised the concern is a standard part of resolving a discordance.

Could the scan be showing something that is not cancer?

Yes. Scans detect metabolic activity and structural change, not cancer directly. In India, tuberculosis is a recognised cause of false-positive PET-CT findings because active TB produces the same kind of uptake as malignancy. Sarcoidosis and post-treatment inflammatory changes have the same effect. A biopsy that returns negative in this situation may genuinely be correct. Your team will weigh this possibility alongside sampling error before deciding on the next step — they are not assuming one explanation before they have reviewed the evidence.

What if results still disagree after repeat testing?

Persistent discordance is uncommon, but it does happen. Your case would typically go to a multidisciplinary tumour board — oncologists, radiologists, and pathologists examining all the evidence together. Some cases reach a conclusion through that review; others are managed as a clinical judgment call based on the overall picture. Where genuine uncertainty remains, your oncologist will explain what it means for treatment decisions and what the options are. A second opinion at a centre experienced in your cancer type is a reasonable next step to consider at this stage.

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Common questions

Frequently asked questions

If the biopsy is negative, does that mean I do not have cancer?

In the context of a scan that shows a suspicious area, a negative biopsy is inconclusive, not a clear all-clear. Your oncologist will not treat it as definitive until the discordance is explained. This is different from a situation where the biopsy was taken because of a vague or low-suspicion finding — in that context a negative result carries more weight. Your team will explain which situation applies to you.

How often do scans and biopsies disagree?

Discordance is a recognised pattern rather than a rare event, and rates vary by cancer type and imaging modality. NCCN and ESMO guidance in multiple tumour types addresses it specifically, which tells you it is common enough to have a documented management pathway. It is more frequent in heterogeneous tumours and in sites that are technically difficult to biopsy, such as deep lymph nodes or poorly vascularised regions of a large mass.

What is a multidisciplinary tumour board and why does my case need one?

A tumour board is a scheduled meeting where oncologists, radiologists, and pathologists review the same case together. Each specialist brings a different perspective: radiology knows what the scan appearances mean; pathology knows whether the biopsy sample was representative. When those two conflict, a joint review is more likely to reach a reliable conclusion than any single specialist working alone. Your case being referred to a tumour board is a sign the system is working correctly, not that something has gone wrong.

Should I get a second opinion on discordant results?

It is a reasonable step and most oncologists will support the request. A second opinion is most useful when the discordance has been reviewed once without a clear explanation, or when a significant treatment decision is being made under uncertainty. Ask for the actual scan images and original biopsy slides to be reviewed directly, not just the reports — the interpretation can differ when the material is examined rather than summarised.

Will the discordance delay my treatment?

It may. The length of any delay depends on what investigation is needed and how urgently treatment would be required if cancer is confirmed. Your oncologist will tell you whether waiting for resolution is safe in your specific situation. If you are worried, ask directly: is it safe to take this time? That question has a clinical answer, and you deserve to hear it.

What should I ask at my next appointment?

Ask three things: exactly why the two results conflict based on what is known so far; what the next investigation is and when the result is expected; and if that result also comes back the same way, what the plan would be after that. Writing the answers down helps — these conversations are hard to recall afterwards. Knowing the path forward reduces uncertainty even before the answer is known.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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