Breast biopsy results: what the pathology report means
A breast biopsy removes a small sample of breast tissue so a pathologist can look at it under a microscope. It is the only way to find out whether a suspicious change is cancer, and most changes checked this way turn out not to be cancer. (MedlinePlus, 2025) Your doctor decides what your result means for you.
Why a biopsy follows some mammograms
On a mammogram report, BI-RADS category 4 means a suspicious finding for which a biopsy should be considered, and category 5 means a finding highly suggestive of cancer, for which a biopsy is very strongly recommended. (ACS report, 2026) The full list of categories is on mammogram results.
MedlinePlus lists other reasons for a biopsy: a lump, thickening or other change you or your provider felt; a lump, calcium deposits or other signs on a mammogram, ultrasound or MRI; red, scaly or swollen skin on the breast or nipple, or a nipple pulled inward; or abnormal fluid from the nipple. Being told you need a biopsy does not mean you have breast cancer. (MedlinePlus, 2025)
Types of breast biopsy
ACS says most of the time a needle biopsy can be done. The type depends on how suspicious the change looks or feels, its size and place in the breast, whether there is more than one area, your overall health and your preferences. (ACS, 2024)
| Type | What the sources say |
|---|---|
| Fine needle aspiration (FNA) | A very thin needle removes a sample of breast cells or fluid. (MedlinePlus, 2025) (ACS, 2024) |
| Core needle biopsy | A hollow needle removes small cylinders (cores) of tissue, each about the size of a grain of rice; several are often taken. ACS says it is often the preferred type when cancer is suspected, because it removes more tissue than FNA but needs no surgery. (MedlinePlus, 2025) (ACS core needle, 2026) |
| Vacuum-assisted biopsy | The needle is attached to a suction device that helps pull tissue into it, so several samples can be taken with one insertion. (ACS core needle, 2026) (RadiologyInfo, 2026) |
| Stereotactic (mammogram-guided) | Mammogram pictures taken from different angles pinpoint the spot. Often used for calcifications or small areas seen on a mammogram but not clearly on ultrasound. You may lie face down with the breast through an opening in the table, or sit up. MedlinePlus says the procedure usually takes about 1 hour, including the x-rays, while the biopsy itself takes only several minutes. (ACS core needle, 2026) (MedlinePlus, stereotactic) |
| Ultrasound-guided | Ultrasound guides the needle while you lie on your back or slightly on your side. It can only be used if the area shows on ultrasound. (MedlinePlus, ultrasound-guided) (ACS core needle, 2026) (RadiologyInfo, 2026) |
| MRI-guided | Used most often for something seen on breast MRI that is unlikely to show on mammogram or ultrasound. You lie on your belly and are given a contrast material (gadolinium) through an IV. (ACS core needle, 2026) (RadiologyInfo MRI, 2026) |
| Surgical (open) biopsy | Surgery removes part of the area (incisional) or all of it (excisional), usually with numbing medicine and sedation or with general anesthesia. If the area cannot be felt, a wire or a small seed or reflector may be placed first, using imaging, to guide the surgeon. (MedlinePlus, 2025) (ACS surgical, 2026) |
During and after a needle biopsy
- Before: tell your provider about all the medicines and supplements you take. MedlinePlus says not to stop or start taking anything unless your provider tells you to, and to say if you are pregnant or have known allergies. (MedlinePlus, 2025) Do not use lotion, perfume, powder or deodorant under your arms or on your breasts. (MedlinePlus, ultrasound-guided)
- During: you are awake. The area is cleaned and numbed; the shot may sting a bit, and you may feel slight discomfort or pressure as samples are taken. A small metal clip may be placed to mark the spot. No stitches are needed. (MedlinePlus, ultrasound-guided) (MedlinePlus, stereotactic)
- After: the breast may be sore and tender for several days, and bruising is common. You will get instructions on activity and caring for the area. (MedlinePlus, ultrasound-guided) (MedlinePlus, stereotactic)
- Risks: infection and bleeding at the biopsy site. (MedlinePlus, 2025) For ultrasound-guided biopsy, RadiologyInfo puts the risk of a collection of blood (hematoma) at less than one percent, and of an infection needing antibiotics at less than one in 1,000. (RadiologyInfo, 2026)
What the results mean
MedlinePlus says it may take several days to a week to get the results. The report is written for your provider, but its most important part is the diagnosis, which falls into one of four groups: normal; abnormal changes that are not cancer and do not raise your risk; abnormal changes that raise your risk; or breast cancer. (MedlinePlus, 2025) The terms you may see:
| Result | What the sources say |
|---|---|
| Normal or benign (not cancer) | No cancer or abnormal cells, or changes that are not cancer, such as fibroadenoma, fat necrosis, cysts or fibrocystic changes. ACS says most benign changes do not need treatment unless they cause bothersome symptoms, and most do not affect future breast cancer risk. (MedlinePlus, 2025) (MedlinePlus, ultrasound-guided) (ACS benign, 2026) |
| Benign but linked to a slightly higher risk | Changes such as usual ductal hyperplasia, radial scar (complex sclerosing lesion), sclerosing adenosis, complex fibroadenoma and multiple papillomas. NCI says these are not cancer and you can have one without ever developing cancer. For a radial scar found on a needle biopsy, ACS says doctors may suggest watching it with imaging or removing more tissue. (NCI, 2025) (ACS benign, 2026) |
| Atypical hyperplasia (ADH or ALH) | More cells than usual in the ducts (ADH) or lobules (ALH), and they look abnormal under the microscope. Not cancer, but linked to a higher breast cancer risk. ACS says that if ADH is found on a needle biopsy, more tissue in that area usually needs to be removed to be sure nothing more serious is nearby. (ACS atypia, 2026) (NCI, 2025) |
| Lobular carcinoma in situ (LCIS) | ACS says LCIS is not cancer, but it raises the risk of breast cancer in both breasts. ACS says most often no treatment is needed when LCIS is found on a biopsy; pleomorphic and florid types are handled differently from the classic type. (ACS LCIS, 2026) |
| Ductal carcinoma in situ (DCIS) | Abnormal cells in the lining of the milk ducts that have not grown into deeper tissue. ACS says DCIS is often described as a precancer, because if left untreated it can sometimes become invasive cancer. The report gives its grade (1 to 3). (ACS DCIS, 2026) |
| Invasive (infiltrating) carcinoma | Cancer cells have grown deeper than the lining of the ducts or lobules and can spread. The most common type is invasive ductal carcinoma; another is invasive lobular carcinoma. The report also gives the grade and the estrogen receptor, progesterone receptor and HER2 status. (ACS cancer, 2026) (MedlinePlus, 2025) |
Do the biopsy and the imaging agree?
A pathologist makes the final diagnosis. The radiologist also checks that the pathology and the image findings explain one another. If they do not, removing the whole biopsy area may be recommended even when cancer was not found. (RadiologyInfo, 2026) When the biopsy was done for calcifications, the pathologist checks that the tissue contains them; if it does, the biopsy sampled the right area. (ACS benign, 2026)
A needle biopsy can still miss a cancer. (ACS core needle, 2026) RadiologyInfo says breast biopsy will occasionally miss a lesion or underestimate the extent of disease, and if the diagnosis remains uncertain, a surgical biopsy will usually be needed. (RadiologyInfo, 2026) (RadiologyInfo MRI, 2026) ACS says a second core needle biopsy or a surgical biopsy may be needed if the results are not clear or your doctor still has concerns. (ACS core needle, 2026)
What happens next, in general terms
If no cancer is found, your doctor will talk with you about whether you need other tests and when your next mammogram is due. If breast cancer is found, more lab tests may be done on the tissue, and you may see other doctors. (ACS surgical, 2026) If the biopsy shows an abnormal condition that is not cancer, you may be referred to a surgeon to discuss removing the whole area to test it more fully. (MedlinePlus, ultrasound-guided) After atypical hyperplasia or LCIS, ACS says your doctor might suggest more frequent breast exams and imaging. (ACS atypia, 2026) (ACS LCIS, 2026)
Where they differ:
- Atypical ductal hyperplasia: ACS says ADH is not yet a precancer; NCI lists ADH, ALH and LCIS under precancerous breast conditions, meaning not cancer but may become cancer. (ACS atypia, 2026) (NCI, 2025)
- LCIS: ACS says it is not clear whether LCIS is a precancer or a general risk factor, because it typically does not turn into invasive cancer if left untreated; NCI groups it with precancerous conditions. (ACS LCIS, 2026) (NCI, 2025)
- Classic LCIS on a needle biopsy: ACS says the best approach is not always clear, and follow-up with breast exams and imaging might be all that is needed; the MedlinePlus encyclopedia says that after an abnormal result, including LCIS, you may be referred to a surgeon to discuss a surgical biopsy. (ACS LCIS, 2026) (MedlinePlus, ultrasound-guided)
- How long results take: MedlinePlus says several days to a week; ACS says at least a few days. (MedlinePlus, 2025) (ACS, 2024)
When to contact your provider
For breast lumps, MedlinePlus says:
Contact your provider if:
- The skin on your breast appears dimpled or wrinkled (like the peel of an orange).
- You find a new breast lump during self-exam.
- You have bruising on your breast but did not experience any injury.
- You have nipple discharge, especially if it is bloody, clear like water, or pinkish (blood-tinged).
- Your nipple is inverted (turned inward) but normally is not inverted.
Also make contact if:
- You are a woman, and want guidance on how to perform a breast self-exam.
- You are a woman age 40 or older and have not had a mammogram in the past year for advice about screening for breast cancer.
After a biopsy, your care team will tell you how to care for the area and when to contact them. (ACS surgical, 2026)
Your doctor decides what your result means for you. ACS suggests asking how soon the results will come, whether you should call or will be called, and who will explain them. (ACS, 2024)
This page does not give treatment or surgery advice. If you have an abnormal result, see after an abnormal screening result for questions to ask.
Questions people ask
Does needing a breast biopsy mean I have cancer?
No. MedlinePlus says most breast lumps and other changes checked with a biopsy turn out to be benign, which means not cancer. ACS says a biopsy is the only way to know for sure. (MedlinePlus, 2025) (ACS, 2024)
How long do breast biopsy results take?
MedlinePlus says it may take several days to a week to get the results, often called a pathology report. ACS says it typically takes at least a few days, and suggests asking when to expect them and who will call you. (MedlinePlus, 2025) (ACS, 2024)
What is the small clip they put in my breast?
A tiny tissue marker placed where the samples were taken, so the area can be found on later mammograms or other imaging. ACS says you cannot feel or see it, it is safe during MRI, and it will not set off metal detectors. (ACS core needle, 2026)
What if the biopsy result does not match what the imaging showed?
RadiologyInfo says the radiologist checks that the pathology and the image findings explain one another. If they do not match, removing the whole area may be recommended even when no cancer was found. (RadiologyInfo, 2026)
Is atypical hyperplasia cancer?
No. ACS says ADH has some but not all of the features of DCIS and is not yet a precancer, although it is linked to a higher risk of breast cancer later. NCI lists ADH and ALH among precancerous breast conditions. (ACS atypia, 2026) (NCI, 2025)
Is LCIS breast cancer?
ACS says LCIS is not cancer, but people with LCIS have a higher risk of breast cancer, in either breast. It is not clear whether LCIS is a precancer or a general risk factor. (ACS LCIS, 2026)
What is the difference between DCIS and invasive cancer?
In DCIS the abnormal cells stay in the lining of the milk ducts. In invasive cancer they have grown into deeper tissue and can spread to other parts of the body. (ACS DCIS, 2026) (ACS cancer, 2026)