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Your biopsy report

What Is — 'Crush Artefact'?

If your biopsy report uses the words 'crush artefact', it is describing physical damage to the tissue sample — not the cancer itself, and not a verdict on your care.

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026

  • A description, not a diagnosis — Crush artefact describes what happened to the sample, not what is happening in your body.
  • Some cancers are especially fragile — Certain tumour types are known to distort under sampling pressure, even with careful technique.
  • Partial damage is common — Often only part of the sample is affected, and the rest may still be enough to work with.
  • Your oncologist decides next steps — Whether another biopsy is needed depends on how much usable tissue the pathologist found.
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Crush artefact is damage to the biopsy sample caused by the needle or forceps compressing the tissue during collection. The cells become distorted and difficult to read under a microscope. It does not mean the biopsy was done badly. Whether your sample is still usable depends on how much of the tissue was affected.

What does 'crush artefact' mean on a biopsy report?

When a biopsy sample is taken, the instrument used to collect it applies pressure to the tissue. In some cases that pressure distorts the cells — compressing them, smearing their nuclei, and collapsing the normal architecture that a pathologist needs to see.

The pathologist notes this as crush artefact. It is a finding about the condition of the sample, not a finding about your cancer.

Some or all of the sample may be affected. If only part of it is distorted, the pathologist will try to work from the areas that are still intact. If the whole sample is affected, a diagnosis may not be possible from that specimen.

Is my sample still usable?

Partial crush artefactComplete crush artefact
What the pathologist can seeSome cells are distorted; others remain readableMost or all cells are too compressed to assess reliably
Can a diagnosis be made?Often yes, from the undamaged areasUsually not from that specimen alone
Can additional tests be run?Sometimes — if enough cells survive intactRarely — distorted cells do not yield reliable results
Likely next stepResult may still be reported, sometimes with a note on qualityRepeat biopsy is usually discussed with your oncologist
Who decides?Your pathologist and oncologist togetherYour oncologist, based on the full clinical picture

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Why does crush artefact happen?

Crush artefact happens when the tissue is soft or fragile and does not withstand the pressure of sampling. Some tumour types — including small cell lung cancer, lymphoma, and certain neuroendocrine tumours — are known to be particularly vulnerable to this kind of distortion.

It is not always avoidable. Even with careful technique, very fragile tissue may compress under the instrument. The pathologist's job is to report what they find, including the condition of the sample.

This is not about blame. It is a recognised limitation of needle biopsy in certain tissue types, and reporting it honestly is part of quality pathology practice.

What should I ask at my next appointment?

  • Ask how much of the sample is still usable — partial crush does not always mean the result is lost.
  • Ask whether the pathologist could still confirm a cancer type or grade from the readable areas.
  • Ask whether additional staining or molecular testing is possible on the remaining tissue.
  • Ask whether a repeat biopsy is recommended, and if so, whether a different technique or site would help.
  • Ask whether your scans and clinical history are enough to guide any immediate decisions while further sampling is arranged.

Did you know?

Small cell lung cancer is so fragile under a biopsy needle that the pattern of crush distortion is itself considered a diagnostic clue — pathologists learn to recognise it.

Crush artefact on your report is not always a problem. Sometimes it is information.

Source: College of American Pathologists (CAP) Pulmonary Pathology Practice Guidelines

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Common questions

Frequently asked questions

Does crush artefact mean my biopsy was done wrong?

Not necessarily. Crush artefact is a recognised risk with certain tissue types, particularly soft or fragile tumours such as small cell lung cancer and lymphoma. Even experienced radiologists and surgeons encounter it with these tumours because the tissue itself does not withstand sampling pressure well. The pathologist flags it to explain the quality of the sample, not to record an error. If you want to understand the specific circumstances, your oncologist can explain what type of biopsy was performed and whether a different approach might reduce the risk if a repeat is needed.

Will I definitely need another biopsy?

Not always. If only part of the sample was crushed, the pathologist may have found enough intact tissue to make a diagnosis or run the molecular tests your oncologist needs. The decision depends on what was readable, what information is still missing, and whether that information is essential before treatment can begin. Your oncologist will weigh this against the risk and difficulty of another procedure. That decision belongs with your treating team, not the report alone.

Can the pathologist still tell if it is cancer?

Sometimes yes, sometimes no. With partial crush, the undamaged areas of the sample may still show enough cellular detail to confirm a cancer type, a grade, or key markers. With complete crush, the distortion makes it impossible to assess the cells reliably, and the pathologist will note that a diagnosis cannot be made from that specimen. Your report will usually indicate which situation applies, and your oncologist can explain what was and was not possible from your specific sample.

What is a repeat biopsy like if one is needed?

A repeat biopsy follows the same general process as the first one. The approach — needle core biopsy, CT-guided, bronchoscopy, or surgical — depends on where the tumour is and what technique is safest for you. Your oncologist may recommend a different method or site if there is reason to think it will yield better tissue. Ask your oncologist what the repeat procedure will involve, what the preparation is, and what the turnaround time for the result is at your centre.

How long will I have to wait for answers if I need another biopsy?

Waiting times vary by centre, by how urgently the result is needed, and by what the biopsy involves. Your oncologist can give you the expected timeline at your centre. If treatment is being delayed specifically because the result is unavailable, say that clearly at your next appointment — teams can sometimes prioritise scheduling when the clinical urgency is explained. In some situations, your scans and clinical history are enough to begin certain parts of management while repeat sampling is being arranged.

Is crush artefact more common with some biopsy methods than others?

Yes. Fine needle aspiration, which draws individual cells rather than a tissue core, is particularly prone to this because fragile cells do not survive the suction well. Core needle biopsy, which removes a small cylinder of tissue, generally preserves architecture better but is still vulnerable with very soft tumours. Surgical biopsy gives the pathologist the most tissue to work with and is least affected. Which method is used depends on where the tumour is, how accessible it is, and what information is needed — your oncologist chooses based on your specific situation, not on a single best option.

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?

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Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

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Recovery and Aftercare

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Biopsy by Body Part

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Understanding Your Report

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IHC and Molecular Markers

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Grading and Scoring Systems

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How Accurate Is a Biopsy?

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If Your Result Is Benign

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