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Understanding your biopsy report

'Atypical Cells' — What the Word Actually Means

If a report has come back with the word 'atypical', you are probably frightened — and confused, because the word is not cancer and it is not normal. This page explains what pathologists mean when they write it, and what it does and does not tell you.

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

  • Not a cancer diagnosis — Atypical describes how cells look under a microscope, not what disease you have.
  • Not always a serious finding — Inflammation, infection, and the body's healing response can all cause cells to look atypical.
  • A prompt for further investigation — The result tells your doctor to look more closely — it does not confirm anything on its own.
  • Written for a doctor, not a patient — Pathology terminology is designed for clinical communication. Your treating doctor translates it for you.
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Atypical means the cells in your sample look different from normal, but the pathologist has not called them cancer. The word describes an appearance, not a diagnosis. Your oncologist will decide what the finding means for you based on where the cells were found and the full picture of your case.

What does 'atypical cells' actually mean?

A pathologist writes 'atypical' when cells look different from normal under the microscope, but not different enough to be called cancer. The word is a precise clinical term, not a casual or alarming observation.

A cell can look atypical for many reasons — inflammation, infection, a healing response, a benign growth, or changes that sit between normal and cancer. All of these can produce a similar appearance on the slide.

The report describes what is visible. Your treating doctor interprets what it means for you, based on where the sample was taken and what else is known about your case.

Is atypical the same as pre-cancer?

It can be, but it does not have to be. Pre-cancer changes are one reason cells look atypical. Inflammation and infection are others — and those have nothing to do with cancer.

The same word on different reports, from different tissues and at different grades, can mean very different things. Your treating team will explain what it means for your specific result.

If this is making you anxious, that is understandable. This terminology was written for a doctor who was expecting it. Ask your team to explain it in plain terms at your next appointment.

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Send your reports across and a specialist will walk you through what they mean — what is known, what is not, and what the options actually are.

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What do the other terms around 'atypical' in your report mean?

Atypia
Any change in cells that makes them look different from what is expected in that tissue. It is a description of an appearance, not a disease.
Reactive atypia
Cells that look abnormal because of inflammation or infection, not because of a pre-cancer change. This type often resolves when the underlying cause is treated.
Dysplasia
Cells that have grown in an abnormal pattern, graded mild, moderate, or severe. Your doctor uses the grade alongside the site and other results to decide what to do next.
ASCUS
Atypical squamous cells of undetermined significance. A specific classification used on cervical smear reports when abnormal squamous cells are found but the cause is not clear.
Undetermined significance
The pathologist found an abnormality but cannot determine the cause from the sample alone. It is a call for further investigation, not a final diagnosis.
Mild / moderate / severe
Grades that describe how far cells have changed from normal. They are different findings with different implications. Your doctor explains what the grade on your report means.

What happens after an atypical result?

Will I need another biopsy?

Maybe, but not necessarily. Your doctor may recommend additional staining tests on the existing sample, a repeat biopsy, or imaging, depending on where the cells were found and what grade of atypia was reported. In some cases the existing sample gives enough material to answer the question. A second biopsy is not bad news — it is often the fastest route to a clearer answer.

Who decides what the result means?

Your treating oncologist or specialist, not the pathologist who wrote the report. The pathologist describes what they saw under the microscope. Your doctor interprets that alongside your symptoms, examination, imaging, and history. The report is one piece of information, not a standalone verdict, and it was not designed to be read without clinical context.

How long will it take to find out more?

That depends on what further tests are ordered. A repeat sample is usually arranged within a few weeks. Additional staining on the existing tissue may add one to two weeks at the laboratory. Ask your team for a timeline at your next appointment. If you have not been told when to come back, call the clinic to ask rather than waiting.

Can an atypical result turn out to be nothing serious?

Yes, in many cases. Reactive atypia — caused by inflammation or infection — often resolves without treatment, or with a short course of treatment for the underlying cause. Whether this is the likely explanation for your result is something your doctor will assess after reviewing the full report and the grade of atypia that was reported.

Did you know?

The word 'atypical' covers such a wide range of findings that professional bodies have created separate classification systems for different tissues — the Bethesda system for cervical and thyroid cytology, the Milan system for salivary gland findings, and others. Each carries its own distinct management pathway.

Knowing which system and which classification applies to your result is why your doctor reviews the full report rather than the label alone.

Source: Bethesda System for Reporting Cervical Cytology; Bethesda System for Reporting Thyroid Cytopathology; Milan System for Reporting Salivary Gland Cytopathology

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Common questions

Frequently asked questions

Why didn't the report just say cancer or not cancer?

Because pathologists report only what the sample shows, and some samples do not contain enough information for a definitive answer. 'Atypical' means the cells show genuine abnormality, but not the specific pattern that allows a condition to be named with confidence. Further tests are usually ordered to get a clearer answer, not because the situation is hopeless.

Does atypical mean my biopsy needs to be repeated?

Not always. Whether a repeat is needed depends on where the sample was taken, what grade of atypia was reported, and what your other results show. In some cases, additional staining on the existing sample is enough to answer the question. In others, a new sample from a different approach is needed. Your doctor will explain which applies to your result.

Can atypical cells go back to normal on their own?

Yes, in certain situations. When atypia is caused by inflammation or infection — reactive atypia — it often resolves once the underlying cause is treated, or on its own over time. Whether that is the likely explanation in your case depends on the type and grade of atypia reported and where in the body the sample came from. Your doctor will assess this after reviewing your full result.

My report says 'atypical squamous cells' — what does that mean?

Atypical squamous cells is a classification used on cervical smear reports and some other cytology reports. The subclassification matters — ASCUS and 'cannot exclude high-grade' describe different degrees of abnormality and have different management pathways. Ask your doctor which subclassification appears on your report and what they recommend next. Do not try to interpret a cytology subclassification without clinical guidance.

How soon should I see my doctor after getting this result?

Within one to two weeks where possible. An atypical result almost never requires an emergency visit, but it does need your doctor to explain what further tests are planned and when. If you received the report directly and have not been contacted by your clinical team, call the clinic rather than waiting for them to reach you.

Should I get a second opinion on this report?

A second pathology opinion is reasonable and accepted practice when a result is unclear or when the management decision depends heavily on the exact diagnosis. You can ask your treating doctor to arrange it, or request your slides be reviewed at a specialist centre. It is a recognised way of adding certainty to a difficult result, not a sign of distrust.

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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