Breast Cancer Information/Diagnosis and Testing

Inconclusive Mammogram: What It Means

Medically reviewed by Maybell Nieves, M.D.

Written by Carrie Madormo, RN, MPH

Posted on August 5, 2026

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Key Takeaways

Getting an inconclusive mammogram result can feel unsettling, but it often just means the images were unclear and more testing is needed to get a full picture.

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Learning that you had an inconclusive mammogram result can be unsettling at first. But it often means that the images from the test were unclear, and the radiologist wasn’t able to read them.

After an inconclusive mammogram, you may be called back for a repeat test or other tests. This is relatively common. Fortunately, fewer than 1 out of 10 women who need more testing are diagnosed with breast cancer.

This article will explain what an inconclusive mammogram is and possible reasons for inconclusive results. We’ll also cover what happens next and when to call your doctor.

What Does an Inconclusive Mammogram Mean?

A mammogram is used for breast cancer detection. It produces images of breast tissue, and a radiologist looks at the images for signs of cancer. An inconclusive mammogram means that the radiologist couldn’t make any conclusions, and you need additional testing.

Radiologists use the Breast Imaging Reporting and Data System (BI-RADS) to give mammogram results a score from 0 to 6. BI-RADS is a scoring system that uses clear language to communicate among physicians. This system gives doctors an objective way to determine a person’s cancer risk.

An inconclusive mammogram is classified as a BI-RADS category 0. They’ll need more tests to determine the BI-RADS score. If you’ve had any previous mammograms, the doctor will also use them for comparison.

The other BI-RADS categories include:

BI-RADS 1 — Negative, no signs of cancer
BI-RADS 2 — Benign, a noncancerous finding
BI-RADS 3 — Likely benign, a finding that needs monitoring
BI-RADS 4 — Suspicious, could be cancer
BI-RADS 5 — Likely cancerous, abnormal findings that appear cancerous
BI-RADS 6 — Known malignancy, follow-up test for cancer that has already been diagnosed

An inconclusive result doesn’t mean you have cancer. It is one of many possible explanations for needing a follow-up mammogram.

5 Common Reasons for Inconclusive Results

Receiving inconclusive mammogram results isn’t uncommon, and there are several reasons why it happens.

Unclear Images

Sometimes mammogram results appear blurry or unclear. Despite a technician’s skill and best efforts, the images may not be clear enough to assess. In this case, the radiologist will classify the result as inconclusive and recommend a repeat mammogram.

It’s important to remember that having unclear images doesn’t mean that the radiologist saw any abnormal or concerning areas.

First Mammogram

It’s more common to have an inconclusive result with your first mammogram. That’s because there are no previous images for the radiologist to review and use for reference.

Once you’ve had a few mammograms, the radiologist will be able to monitor for any changes and identify new findings more easily.

Dense Breast Tissue

Dense breast tissue is the most common reason for a mammogram to be reported as inconclusive. In your mammogram results, the radiologist will include an assessment of how dense your breast tissue is.

The breasts are made up of fatty, fibrous, and glandular tissue. Dense breasts have more fibrous and glandular tissue than fat tissue. It’s common to have dense breast tissue — about 45 percent of women do.

Fibrous and glandular tissue appears white on a mammogram image. This makes it harder to see the rest of the breast, including any abnormalities. This can lead to an inconclusive result.

Breast Asymmetry

Your mammogram results may be inconclusive because of breast asymmetry, when some areas of your breast appear denser than others. This can make it harder for the radiologist to see all areas of the breast.

Being called back because of breast asymmetry is usually not serious. It means that the radiologist needs more images to rule out cancer and any other abnormalities.

A New Finding

Your mammogram may be considered inconclusive if the radiologist noticed a new finding but can’t see it clearly. Any new shape in the breast needs to be evaluated right away.

Possible new findings on a mammogram include:

Breast calcifications — Calcium deposits in the breast tissue that are usually benign
Breast cysts — Fluid-filled sacs in the breast tissue that may require a biopsy
Breast mass — A solid mass in the breast that appears as a white, dense area on mammogram images, which usually requires further testing

While most inconclusive mammograms don’t turn out to be cancer, it’s important to schedule your follow-up tests right away.

What Happens Next: Follow-Up Imaging and Testing

When your mammogram results are inconclusive, your healthcare provider will likely call you to discuss next steps. If you see inconclusive results in your online patient portal, don’t hesitate to call your provider to learn more.

Diagnostic Mammogram

The first step is usually having another mammogram called a diagnostic mammogram. Many women aged 40 and older receive regular screening mammograms, although screening rates and recommended frequency vary by age and guideline. A diagnostic mammogram is similar but takes more pictures, especially around any areas of concern.

During a diagnostic mammogram, the technician may apply more pressure to any areas that weren’t clear in the previous test. This can provide more detailed images. A radiologist usually reviews diagnostic mammogram images during the test, so you can expect to receive your results quickly.

Breast Ultrasound or Breast MRI

If needed, your healthcare provider may also recommend a breast ultrasound. An ultrasound is a noninvasive test that uses sound waves to produce images of the inside of the breast. Your provider may also recommend an MRI of the breast.

Once you complete these additional tests, the radiologist will tell you what they see. The doctor might ask you to come back in a year or sooner if there’s an area they want to watch. If the doctor is concerned you may have cancer, they’ll send you for a breast biopsy.

Breast Biopsy

A breast biopsy is used to diagnose breast cancer. During a biopsy test, your doctor removes small pieces of breast tissue using a needle or by cutting into the skin. They’ll then send the tissue sample to the lab for a pathologist to examine under a microscope. Once the biopsy results are back, your doctor will call you to discuss them.

When To Talk to Your Doctor

Learning that you’ve had an inconclusive mammogram can bring up a lot of emotions. It’s natural to feel anxious, sad, or angry about not having a clear answer and needing to wait for more tests.

It’s important to remember that 1 in 10 screening mammograms result in a callback. And of those callbacks, 9 in 10 are not cancer, according to the American Cancer Society.

Don’t hesitate to talk with your doctor if you have any questions or concerns. It may also be helpful to talk about your feelings with friends and family. A mental health provider can provide support too.

While it can feel frightening to have an inconclusive mammogram, it’s important to address it right away. Talk with your doctor and schedule your follow-up tests as soon as possible. Mammograms save lives, so don’t delay your next one.