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False Negatives & Accuracy

Accuracy by Body Site: — A Comparison

A biopsy taken from one part of the body is not as reliable as one taken from another. The site matters — and so does the technique used to reach it. Knowing this helps you ask the right questions when a result surprises you.

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

  • Site affects reliability — Some locations are easy to sample well. Others carry a higher risk of the needle missing the target.
  • Skin and lymph nodes rank highest — These are accessible, and adequate tissue is usually straightforward to obtain.
  • Liver and lung carry more uncertainty — Small lesions, limited access, and sampling error all reduce reliability at these sites.
  • Negative does not always mean clear — At higher-risk sites, a result showing no cancer does not always mean no cancer is present.
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Skin and lymph node biopsies are generally the most reliable. Liver, lung, and bone lesions carry a higher risk of sampling error — where the needle misses cancer tissue that is present. The main reasons are difficult access, tumour size, and how little of the affected area any single sample covers.

Why does biopsy accuracy differ between body sites?

Accuracy depends on whether the needle reaches the right spot, whether the tissue collected is representative of the whole lesion, and whether enough of it is there for the pathologist to work with.

Surface sites — skin, superficial lymph nodes — are easy to reach and can be sampled repeatedly if needed. Deep-seated lesions in the liver, lung, or bone require imaging guidance, a longer approach, and often only one or two passes to limit risk to the patient.

Tumour size also matters. A large, accessible mass gives the needle many opportunities to collect abnormal cells. A small, deep lesion of a centimetre or less offers a much smaller target, and a miss is more likely.

Terms your biopsy report may use — and what they mean

Sampling error
When the needle enters the correct area but collects tissue from just beside the tumour rather than from within it. The result shows no cancer, but the cancer is still there.
False negative
A result that reports no cancer when cancer is present. Sampling error is the most common cause in solid tumours.
Inadequate sample
The pathologist receives too little tissue, or tissue damaged in transit, to make a reliable call. This is not a negative result — it means the biopsy needs to be repeated.
Image-guided biopsy
The radiologist uses live ultrasound, CT, or MRI to steer the needle to the lesion. This significantly reduces but does not eliminate the risk of sampling error.
Discordant result
When the biopsy finding does not match what the scan and clinical picture suggest. A discordant result is an indication to investigate further, not to accept one finding over the other.

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What your team does when a result does not match the clinical picture

  1. Review the imaging

    The radiologist confirms the needle reached the correct location and that the tissue sampled corresponds to the area of concern on the scan.

  2. Check the sample adequacy

    The pathologist confirms whether the tissue received was representative. An inadequate sample is not a negative result — it means the question is still open.

  3. Request a second pathology opinion

    A second pathologist reviews the same slides. This is standard practice at specialist centres when a result is unexpected or the clinical team is uncertain.

  4. Consider a repeat biopsy or different technique

    If the first biopsy was a fine needle, a larger core or excisional approach may give a clearer answer. A different imaging route — endoscopic or surgical — may reach the lesion more reliably.

  5. Discuss at a multidisciplinary team meeting

    The oncologist, radiologist, and pathologist review the case together. No single result is acted on in isolation when the clinical picture and biopsy do not agree.

Which biopsy sites are most and least likely to give a clear answer?

Skin biopsies are among the most reliable in oncology. The lesion is visible and accessible, and the entire suspicious area can be removed excisionally if there is any doubt — eliminating sampling error at source.

Lymph node biopsies are reliable when a core or excisional sample is taken. Fine needle aspiration of lymph nodes carries a higher false negative rate and cannot always classify lymphoma subtypes, which is why core or excisional approaches are preferred when the result will guide major treatment decisions.

Liver and lung biopsies carry the greatest uncertainty, particularly for small lesions. NCCN guidance on image-guided biopsy explicitly recognises that a negative result from a small target does not exclude malignancy when clinical suspicion remains high. A discordant result at these sites should prompt further review, not discharge.

Site by site: what affects accuracy at each location

Skin

High reliability. The lesion is visible, and the pathologist can receive the entire suspicious area through excisional biopsy rather than a sample taken from it. Sampling error is not the primary concern here. When diagnostic uncertainty occurs at this site, it is more often in pathology interpretation of an unusual lesion than in the sampling technique itself.

Lymph nodes (surface)

Reliable when a core needle or excisional sample is used. Fine needle aspiration provides cells rather than tissue architecture, and lymphoma subtyping — which directly affects treatment choice — usually requires intact tissue to classify correctly. When treatment planning depends on subtype, excisional biopsy is the preferred standard according to ESMO and NCCN guidance.

Breast

Image-guided core needle biopsy under ultrasound or mammographic guidance is reliable for most lesions. Reliability falls for very small lesions and for certain rare subtypes. When a core biopsy returns benign but the scan looks suspicious — a discordant result — the standard approach is repeat biopsy or surgical excision, not discharge.

Liver

Sampling error is a recognised limitation, particularly for lesions under two centimetres. A single needle pass may not be representative of the lesion as a whole. When clinical and radiological suspicion is high and the first biopsy is negative, most specialist guidelines support repeat biopsy by an alternative route rather than treating the negative as definitive.

Lung

Peripheral lung lesions reached via CT-guided needle are more prone to sampling error than central lesions reached by bronchoscopy. The number of needle passes that can safely be made is limited by the risk of pneumothorax. A negative result from a suspicious peripheral lung lesion should be discussed with your team rather than taken as a clearance.

Bone marrow

Highly reliable for haematological cancers such as leukaemia and lymphoma when a trephine biopsy is performed. Bilateral trephine biopsies — taken from both sides of the pelvis — improve yield for conditions with patchy marrow involvement. This is an established approach in ESMO and NCCN lymphoma staging guidance.

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Common questions

Frequently asked questions

My liver biopsy came back negative but my scan still looks suspicious. Could the biopsy be wrong?

Yes, a negative liver biopsy can be a false negative, and NCCN guidance explicitly states that a negative image-guided biopsy of a small lesion does not exclude malignancy when clinical suspicion remains high. Your oncologist should review the imaging and the biopsy report together. If the two do not match, a repeat biopsy or alternative sampling route is the appropriate next step, not discharge.

Is a fine needle aspiration as accurate as a core needle biopsy?

For most cancers, no. Fine needle aspiration collects individual cells; core needle biopsy collects a tissue cylinder that preserves architecture. Lymphoma subtyping — which determines treatment — usually cannot be done reliably from aspiration alone. If an aspiration result is being used to guide a major treatment decision, it is reasonable to ask whether a core or excisional biopsy is needed to confirm it.

Can I ask for a repeat biopsy if I am not satisfied with the result?

Yes, and in some situations your team may already be planning one. If the clinical picture and the biopsy result do not match, or if the pathologist flagged the sample as inadequate, a repeat biopsy is standard practice — not an unusual request. Ask your oncologist directly: does this result match what the scan shows, and is a second approach being considered?

What does it mean if the pathologist says the sample was inadequate?

It means the tissue received was too sparse or too damaged to make a reliable call. It is not a negative result — the pathologist has not said no cancer is present. It means the question has not yet been answered. A repeat biopsy is usually needed. Ask your team how soon it can be arranged and whether a different technique will be used to improve the sample quality.

Does the hospital where the biopsy was done affect how reliable the result is?

The technique and the experience of the team matter more than the hospital name. Reliability is influenced by whether image guidance was used, how many cores or passes were taken, and how the sample was handled before it reached the pathologist. If you have concerns, a second pathology opinion on the existing slides is often the fastest way to get reassurance without requiring a new procedure.

Should I get a second pathology opinion if my result surprises me?

A second pathology opinion — where a different pathologist reviews your existing slides — is a reasonable and accepted step when a result is unexpected or when it will guide a major treatment decision. It does not require a new biopsy. Most specialist centres do this routinely for complex or borderline cases. If it has not been offered, ask your oncologist to arrange it. Raise any persistent concerns with your treating team.

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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