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Breast biopsy

Ultrasound-Guided — Breast Biopsy

If your doctor has found a lump on ultrasound and wants to know what it is, a core needle biopsy guided by real-time ultrasound is the standard next step. Most results come back showing a benign finding.

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

  • Quick and outpatient — The procedure itself usually takes around 30 minutes. You go home the same day.
  • No general anaesthetic — Local anaesthetic numbs the area. You are awake throughout and can speak to the radiologist at any point.
  • Most results are benign — The majority of breast lumps biopsied turn out to be non-cancerous.
  • Tissue, not just imaging — A biopsy gives your team actual cells to examine. No treatment decision is made from imaging alone.
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An ultrasound-guided core needle biopsy takes a small tissue sample from a breast lump while a live ultrasound image guides the needle. The procedure typically takes around 30 minutes, is done under local anaesthetic, and most samples come back showing a benign finding, not cancer.

How does an ultrasound-guided breast biopsy work?

A hollow needle is guided to the exact position of the lump using live ultrasound images shown on a screen beside you. The needle removes a thin cylinder of tissue — this sample goes to a pathologist who examines it under a microscope.

A spring-loaded device fires the needle through the lump in a fraction of a second. You will hear a clicking sound each time. Most people feel pressure rather than sharp pain.

Several passes are made through a single small skin entry point. A tiny metal marker clip is sometimes left at the site so future scans can locate the same area.

How reliable is the result?

Core needle biopsy under ultrasound guidance is considered the reference standard for breast lumps visible on ultrasound. ASCO and NCCN guidance recommends it as the preferred first approach because it provides actual tissue, not an inference from imaging.

Occasionally a sample comes back non-diagnostic — the needle may have grazed the edge of a small lump, or the tissue may be too fragmented for the pathologist to read clearly. If this happens, your team will discuss whether a repeat sample is needed.

No biopsy result is interpreted in isolation. Your oncologist will consider it alongside your imaging findings and clinical examination before making any recommendation.

How long does the whole appointment take?

Allow around 90 minutes in total. The biopsy itself usually takes around 30 minutes; the rest is for preparation, positioning, and a short period of observation to confirm the site is not bleeding before you leave.

Most people can drive home or use public transport afterwards. Desk work is usually possible the same day. Strenuous activity and heavy lifting are best avoided for a day or two.

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What happens during the procedure, step by step?

  1. Positioning

    You lie on your back or side with your arm raised. The radiologist cleans the skin with antiseptic solution.

  2. Ultrasound scan

    The radiologist scans the area to locate the lump and plan the safest path for the needle.

  3. Local anaesthetic

    A small injection numbs the skin and tissue beneath. This stings for a few seconds, then the area should feel numb.

  4. Needle insertion

    A tiny nick in the skin allows the biopsy needle in. You feel pressure but should not feel sharp pain. Say so immediately if you do — more anaesthetic can be given.

  5. Samples taken

    The spring-loaded device fires through the lump with a clicking sound. Several passes collect tissue from different parts of the lump.

  6. Marker clip placed

    A small metal clip may be placed at the biopsy site. It is harmless and helps radiologists locate the same spot on future scans.

  7. Dressing applied

    Firm pressure is held on the site for several minutes to reduce bruising, then a dressing is applied and you rest briefly before leaving.

What should you do before and after your biopsy?

  • Tell your team about any blood-thinning medicines — aspirin, warfarin, or similar — before the appointment.
  • Wear a comfortable, supportive bra on the day; it helps hold the dressing in place.
  • Bring someone with you if possible, in case you prefer not to drive immediately afterwards.
  • Keep the dressing dry for the first 24 hours.
  • Paracetamol is usually enough for soreness; avoid ibuprofen or aspirin for the first day unless your team advises otherwise.
  • Some bruising and mild swelling is normal and usually settles within a week.
  • Call your team if you notice unusual swelling, warmth, redness, or discharge from the site after you get home.

Questions people ask before their biopsy

Will it hurt?

The local anaesthetic injection stings briefly, then the area should be numb. Most people feel pressure when the needle fires, not sharp pain. If you feel anything sharp during the biopsy itself, tell the radiologist immediately — they can add more anaesthetic before continuing. Soreness over the following days is normal and usually settles with paracetamol.

Will the biopsy leave a scar?

The skin entry point is only a few millimetres wide and in most cases heals with little visible change. Bruising appears in the first few days and fades within one to two weeks. Whether any lasting mark remains varies between people and depends on how your skin heals — cosmetic outcomes are variable and cannot be guaranteed in advance.

What if I have a needle phobia?

Tell the team before the procedure, not while you are already on the table. Many people feel anxious, and the team can slow the pace, explain each step as they go, and pause when needed. Sedation is not routinely given for this procedure; if your anxiety is severe, ask your oncologist in advance whether additional support is appropriate for you.

What happens to the tissue sample?

The samples are sent to a pathology laboratory where a specialist examines them under a microscope. The report describes the cells precisely — whether they are normal, benign but changed, or cancerous, and if cancerous, what type and receptor status. This report is what your oncologist uses to plan any next steps. Results typically take several days to a week.

Can a family member come into the procedure room?

This varies by centre and depends on the layout and how busy the room is on the day. Ask when you book — many centres allow one support person during preparation and in some cases during the biopsy itself. If it matters to you, mention it when you call to schedule rather than on the day of the procedure.

Can a biopsy cause cancer to spread?

This fear is very common and worth taking seriously rather than dismissing. The evidence reviewed by major bodies including ASCO does not show that core needle biopsy causes clinically meaningful spread of cancer cells along the needle track. The information a biopsy provides changes outcomes — forgoing one to avoid a theoretical risk generally does the opposite of protecting you.

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Common questions

Frequently asked questions

How soon will I get the biopsy result?

Most reports are ready within a few days to a week, though turnaround times vary between laboratories and whether specialist staining is needed. Your team will usually ask you to come in for the result rather than giving it over the phone. If you have not heard after ten working days, contact the nurse coordinator — do not wait and worry in silence.

What does a benign result actually mean?

A benign result means the cells in the sample show no cancer and no pre-cancerous change. Your team will tell you whether any follow-up imaging is needed or whether the lump can simply be monitored at intervals. In most cases a benign biopsy is genuinely reassuring — but the follow-up plan depends on exactly what the pathologist found and your overall breast history, so ask your team what it means for you specifically.

What happens if the result shows cancer?

Your oncologist will arrange a meeting to go through the report with you. A cancer result tells your team what type the cancer is, which receptors it carries, and how the cells look under the microscope — all of which shape the treatment plan. No decision about surgery, radiotherapy, or systemic treatment is made without this information. You will not be expected to respond on the spot, and asking for a second opinion before any decision is always reasonable.

Can I eat and drink normally before the biopsy?

Yes. Because this procedure uses only local anaesthetic, you do not need to fast. Eat and drink as normal on the day. Continue your regular medicines unless your team has specifically told you to pause a blood-thinning medicine before the appointment — if you are unsure, call and ask rather than stopping something on your own.

Is this different from a fine needle aspiration?

Yes. A fine needle aspiration draws out individual cells using a thinner needle; it is quicker but gives less information, and often cannot reliably identify the cancer type or receptor status. A core needle biopsy removes a tissue cylinder that gives the pathologist far more to work with. Most guidelines, including those from ASCO and ESMO, now recommend core needle biopsy over fine needle aspiration when the result will guide treatment decisions.

Is this biopsy available at CION centres?

Yes. Ultrasound-guided core needle biopsy is performed as a day procedure at CION centres. Follow-up imaging such as PET-CT is coordinated with partner imaging centres. If your result requires further molecular testing or multidisciplinary review, your team will arrange that as part of the same care pathway without you having to chase it separately.

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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