When is a Breast Biopsy Needed, and What Happens Next?

When a breast abnormality is identified during a mammogram, ultrasound or MRI scan, further investigation may be needed to determine its nature.

In some cases, additional imaging provides sufficient information. In others, a breast biopsy may be recommended to obtain a sample of cells or tissue for examination.

A biopsy is an important part of the diagnostic process because imaging alone cannot always establish whether an abnormality is benign or cancerous.

Understanding why a biopsy is recommended, how the procedure is performed and what happens to the tissue samples afterwards can help you know what to expect.

1. When Might a Breast Biopsy Be Recommended?

A breast biopsy may be recommended when an abnormality identified through imaging or clinical examination requires further investigation.

This may include:

• A breast lump with imaging features that require tissue examination.

• An area of architectural distortion on a mammogram.

• Microcalcifications that need further assessment.

• An abnormality identified on ultrasound or MRI.

• A finding that cannot be confidently classified through imaging alone.

Not every breast abnormality requires a biopsy. Some findings have characteristic benign appearances and may only require routine follow-up or additional imaging.

When a biopsy is recommended, it is because examining the cells or tissue can provide information that imaging alone cannot establish with sufficient certainty.

2. Does a Breast Biopsy Mean You Have Cancer?

No. A breast biopsy is performed to determine the nature of an abnormality. It does not mean that cancer has already been diagnosed.

The results may indicate:

• Benign findings: Non-cancerous changes in the breast that may require no further treatment or routine monitoring.

• High-risk or atypical lesions: Certain abnormal cell or tissue changes that may require further assessment or management.

• Malignant findings: Cancerous changes that require further clinical evaluation and treatment planning.

The appropriate next step depends on the biopsy findings, imaging appearance and clinical assessment.

If the pathology findings do not adequately explain the imaging abnormality, further investigation may be necessary. This is why imaging and pathology findings need to be considered together.

3. What Are the Different Types of Breast Biopsy?

There are several techniques for obtaining breast tissue or cell samples. The most appropriate method depends on the type, size and location of the abnormality, as well as how clearly it can be seen on imaging.

Core Needle Biopsy (CNB)

A core needle biopsy uses a hollow needle to remove small samples of breast tissue for examination.

Local anaesthesia is usually administered to numb the area before the procedure. The needle is guided towards the abnormality using ultrasound, mammography or MRI, depending on where the finding can be seen.

Core needle biopsy provides tissue samples that preserve the structure of the breast tissue, allowing the pathologist to examine the cells and their arrangement.

Vacuum-Assisted Biopsy (VAB)

A vacuum-assisted biopsy uses a specialised needle connected to a suction device to collect multiple tissue samples through a small skin incision.

The technique allows several samples to be obtained through a single needle insertion. It may be used for selected breast abnormalities, including certain small lesions or areas of microcalcification.

Depending on the size and nature of the abnormality, vacuum-assisted biopsy may also be used to remove certain small, benign breast lesions.

VAB is primarily a diagnostic procedure and is not a substitute for surgery to remove breast cancer.

Fine Needle Aspiration (FNA)

Fine needle aspiration uses a thin needle to collect cells or fluid from a breast lump or other targeted area.

It may be suitable for selected cases, including the assessment of certain cysts or lumps. However, unlike a core needle biopsy, it collects individual cells rather than larger tissue samples.

The choice between fine needle aspiration and a core needle biopsy depends on the clinical question and the information needed to establish a diagnosis.

4. How is a Breast Biopsy Performed?

Most breast biopsies are performed as image-guided procedures, allowing the doctor to target the area of concern accurately.

The imaging technique used depends on how the abnormality is visualised.

Ultrasound-guided biopsy

When an abnormality can be clearly seen on ultrasound, the radiologist uses real-time ultrasound images to guide the needle into the targeted area.

Mammography-guided biopsy

For findings such as certain areas of microcalcification that are visible on mammography, stereotactic or mammography-guided biopsy may be recommended.

MRI-guided biopsy

If an abnormality is visible on MRI but cannot be adequately targeted using ultrasound or mammography, an MRI-guided biopsy may be considered.

The procedure generally involves:

1. Positioning the patient appropriately for the imaging technique.

2. Cleaning the skin and administering local anaesthesia where required.

3. Guiding the biopsy needle towards the abnormality using imaging.

4. Collecting the required tissue or cell samples.

5. Applying pressure and a dressing to the biopsy site.

Some biopsy procedures may be performed under sedation when clinically appropriate. The doctor will explain the recommended technique and any preparation or recovery arrangements before the procedure.

5. What Happens to the Tissue Samples After a Biopsy?

Once collected, the tissue samples are sent for pathological examination.

A pathologist examines the samples under a microscope to assess the structure and characteristics of the cells and tissue.

The pathology report may describe:

• The type of breast tissue or lesion identified.

• Whether the findings are benign, atypical or malignant.

• The specific characteristics of any abnormal cells.

• Additional tests or biomarkers, where indicated.

For certain breast cancer diagnoses, further testing may be performed to assess biomarkers such as:

• Oestrogen receptor (ER): Indicates whether the cancer cells express receptors for oestrogen.

• Progesterone receptor (PR): Indicates whether the cancer cells express receptors for progesterone.

• HER2: Assesses whether the cancer cells show HER2 protein overexpression or gene amplification, which may have implications for treatment.

• Ki-67: Provides an indication of the proportion of tumour cells undergoing proliferation.

These findings can help doctors better characterise a breast cancer and guide treatment decisions.

The pathology findings are interpreted alongside imaging and clinical information to establish the most appropriate diagnosis and management plan.

6. Why Must Imaging and Pathology Findings Be Considered Together?

Imaging and pathology provide different but complementary information.

Radiologists assess the appearance, location and characteristics of an abnormality through mammography, ultrasound or MRI.

Pathologists examine the collected tissue or cells to determine the nature of the finding.

Both are important in establishing a diagnosis.

For example, if imaging identifies a suspicious breast mass and the biopsy shows a benign result, the radiologist and treating doctor may need to assess whether the pathology findings adequately explain the imaging appearance.

If the findings are not considered concordant, further investigation or another biopsy may be recommended.

This process, known as radiological-pathological correlation, helps ensure that the biopsy findings are consistent with the original imaging abnormality.

7. What Happens After the Biopsy Results Are Available?

Once the pathology report is ready, your treating doctor will discuss the findings and explain what they mean.

The next steps depend on the diagnosis.

If the findings are benign

No further treatment may be required. Depending on the type of lesion and imaging findings, your doctor may recommend routine screening or follow-up imaging.

If the findings show an atypical or high-risk lesion

Further assessment or surgical removal may be considered for certain lesions. The recommendation depends on the specific pathology diagnosis, imaging findings and individual circumstances.

If cancer is diagnosed

Your breast specialist will discuss the diagnosis and appropriate treatment options. Additional investigations may be recommended to determine the extent of disease and support treatment planning.

These may involve further imaging, pathology assessment and consultations with the relevant specialists.

8. Breast Imaging and Pathology at Luma

Breast imaging and pathology play complementary roles in the assessment of breast abnormalities.

At Luma Women's Imaging Centre, breast imaging services include 3D mammography, ultrasound and MRI, alongside image-guided breast biopsy procedures.

Tissue samples obtained through biopsy undergo pathological examination, supported by Luma's on-site pathology facility and dedicated breast pathologist. Breast cancer biomarker assessment, including ER, PR, HER2 and Ki-67, is also available through arrangements with partner laboratories.

By bringing together breast imaging, diagnostic procedures and pathology expertise, Luma supports coordinated assessment in collaboration with referring doctors and breast specialists.