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Image-guided biopsy

Stereotactic Breast Biopsy — What to Expect, Step by Step

A stereotactic breast biopsy is a needle biopsy guided by X-ray images rather than ultrasound. The X-ray is needed because the calcifications it targets are often too small and faint for ultrasound to find. The imaging guides the needle — it is not a separate scan.

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

  • For calcifications, not lumps — Stereotactic biopsy is used when calcifications are too small or faint for ultrasound to detect, but show clearly on mammogram.
  • X-ray pinpoints the position — Paired images taken from two angles calculate the exact depth and location of the calcifications before the needle is placed.
  • Positioning is the hard part — Lying still face down for 30 to 45 minutes is the most uncomfortable part. The needle itself is given under local anaesthetic.
  • Same-day discharge — No general anaesthetic is needed. Most people go home within an hour of the procedure finishing.
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Stereotactic breast biopsy uses X-ray images taken from two angles to pinpoint microcalcifications and guide a needle to sample them. It is chosen when calcifications are too small or scattered for ultrasound to detect. The procedure is done under local anaesthetic; the positioning on the table is the most uncomfortable part, not the needle.

What happens during the procedure, step by step?

  1. Positioning on the table

    You lie face down on a padded table with one breast resting through an opening. The team works from below. You stay in this position for around 30 to 45 minutes, so mention any back or neck pain before you start.

  2. Mammogram images locate the calcifications

    The system takes two X-ray images from slightly different angles. These are used to calculate the exact three-dimensional position of the calcifications so the needle can be placed precisely.

  3. Local anaesthetic is given

    The skin and tissue above the target are numbed with an injection. You may feel a brief sting. Once the anaesthetic works, you should not feel sharp pain during sampling.

  4. A small opening is made

    A nick a few millimetres wide is made in the skin. No stitches are needed afterwards — a small dressing is sufficient.

  5. Tissue samples are taken

    The needle is guided to the target. A vacuum-assisted device removes several small tissue cores. You may feel mild pressure and hear a clicking sound. If you feel sharp pain, tell the team immediately.

  6. A marker clip is placed

    A small titanium clip is left at the biopsy site. It shows on future imaging that this area has been sampled. It is safe for MRI and causes no discomfort.

  7. Dressing and discharge

    Pressure is applied to the site and a dressing placed. Most people go home within an hour of finishing.

Why is X-ray used instead of ultrasound?

Microcalcifications are tiny calcium deposits in breast tissue. They show clearly on mammogram but are often too small and faint for ultrasound to detect reliably.

Stereotactic guidance turns this into a precise tool. The system takes two mammogram images from slightly different angles and uses them to calculate the exact depth and position of the calcifications in three dimensions before the needle moves.

This is why your radiologist chose this approach. It is not a more serious or complex test — it is the right tool for the specific finding that needs to be sampled.

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Before your appointment: what to prepare

  • Tell your team about all medicines — including blood thinners, aspirin, warfarin, and herbal supplements. You may be asked to pause some beforehand.
  • Wear a two-piece outfit. You will need to remove your top and bra.
  • Do not apply deodorant, talcum powder, or cream to your chest or underarm on the day.
  • Eat normally. You do not need to fast for this procedure.
  • Arrange for someone to accompany you home. The breast will be sore when the numbing wears off.
  • Tell your team if you are or might be pregnant before the appointment.

Is the procedure painful?

Most people say the positioning is the most difficult part. Lying still face down for 30 to 45 minutes can become uncomfortable, particularly if you have back or shoulder pain. Tell the team if you need a short break — this is common and expected.

The biopsy itself is done under local anaesthetic. You may feel pressure as the needle advances and hear a clicking sound when samples are taken. Sharp pain during sampling is unusual; if you feel it, say so and more anaesthetic can be given.

The breast will be bruised and tender for a few days. Paracetamol manages this for most people. Avoid aspirin for pain relief unless your doctor has said it is safe for you.

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Common questions

Frequently asked questions

What does it mean that microcalcifications were found on my mammogram?

Finding microcalcifications is not a diagnosis of cancer. Most calcium deposits in breast tissue are completely harmless, caused by normal changes in cells. Certain patterns — particularly small, clustered deposits — are biopsied because they need to be characterised precisely rather than just monitored. The biopsy answers the question of what those deposits are. Most biopsies come back showing benign tissue.

How long will it take to get the results?

Results usually take three to five working days after the tissue reaches the laboratory, though this varies. Ask at your appointment who will contact you, by which method, and by when — whether that is your radiologist, referring doctor, or oncology team. Write this down. If you have not heard by the date given, call the clinic rather than waiting.

The clip stays inside me permanently?

The clip is a small titanium marker about the size of a sesame seed. It stays at the biopsy site permanently unless a surgeon removes it during a later operation. Titanium is safe for MRI and causes no pain or interference with daily life. Many women live their whole lives with one without noticing it. The clip exists to help future imaging teams know exactly where tissue was taken.

Can I drive myself to and from the appointment?

You can usually drive yourself, as the procedure uses only local anaesthetic. However, the breast will be sore when the numbing wears off and the appointment can leave you tired. It is easier to have someone with you. Confirm with your team before the day, as individual circumstances sometimes affect this advice.

Will I need more procedures if the result is benign?

Most benign results need no treatment — only a follow-up mammogram at an interval your radiologist recommends, typically around six to twelve months later, to confirm the calcifications are stable. Some benign findings prompt a repeat or slightly larger sample if the result does not fully account for what the imaging showed. Your radiologist will tell you what follow-up applies to your specific result.

Is the X-ray radiation used during the procedure harmful?

The radiation dose used for stereotactic guidance is low and comparable to a standard diagnostic mammogram. IAEA and WHO guidance indicates this level of radiation does not carry a meaningful health risk for adults undergoing the procedure. If you are pregnant or may be pregnant, tell your team before the appointment — the approach may be adjusted.

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