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Breast Cancer Diagnosis

Written by sshowalter.

Your practitioner should discuss with you your medical history, including any family history of breast cancer. Your breasts will be examined for characteristic symptoms, including lumps or thickening, nipple discharge or inversion, redness or changes in the skin or contour of the breast. Read more about the preventive screenings for breast cancer.

If breast cancer is suspected, the tests listed below may be preformed.

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Diagnosis Methods


A mammogram is an x-ray of the breast that can often find tumors that are too small for you or your doctor to feel. The accuracy of a mammogram to detect cancer will depend on such factors as the size of the tumor, your age, breast density, and the skill of the radiologist. Although mammograms are the most sensitive test currently used to evaluate the breast, they will miss 10%-15% of breast cancers. Mammograms are also recommended regularly for some women as a preventive screening. Read more about this on the mammography/mammogram page.

Other imaging tests, including MRIs, are being studied to see if they are more sensitive than mammograms.


During ultrasonography, sound waves (called ultrasound) are bounced off tissues, and the echoes are converted into a sonogram, or a picture. Ultrasound is used to evaluate lumps that have been identified via breast self-exam, clinical breast exam, or mammography. They help to see if a mass is solid or has liquid in it. Solid masses are generally more concerning than cystic or liquid-filled masses. Further Testing

Depending on the outcome of these tests, your doctor may simply continue to monitor subsequent breast changes, or may decide to do further testing. In some cases, your doctor may decide to remove a sample of tissue to be examined in the lab. This sample may be taken by one of the following methods:

Fine needle aspiration —A thin needle is used to remove fluid and/or cells from a breast lump. If the fluid is clear, it may not need to be checked by a lab.

Large needle (or core) biopsy—In this procedure, tissue is removed with a large-bore needle from a suspicious area.

Surgical biopsy —During a surgical biopsy, all or part of a breast lump is removed for lab examination. An incisional biopsy removes a small portion of a large lump, while an excisional biopsy removes the entire lump (usually small).

Keep in mind that your doctor may recommend proceeding directly to biopsy if the lump is clinically suspicious. The only way to absolutely confirm the diagnosis of breast cancer is by tissue examination.

Stages of Breast Cancer

If cancer is found, your prognosis and treatments depend on the location, size, and stage of the cancer.

To determine the stage, the doctor uses the following classification system:

  • Stage 0—Called "in situ" (within the site of origin), the cancer remains in the breast and has not spread.
  • Stage I—Cancer has spread beyond the lobe or duct and invaded nearby tissue. At this stage, the tumor is no larger than two centimeters in size and has not spread beyond the breast.
  • Stage II—Stage II means one of the following: o Tumor in the breast is less than two centimeters in size and the cancer has spread to the lymph nodes under the arm, or o Tumor is between two and five centimeters in size (with or without spread to the lymph nodes under the arm) or o Tumor is larger than five centimeters but has not spread to the lymph nodes under the arm
  • Stage III—The tumor is large (more than five centimeters in size) and the cancer has spread to the lymph nodes. Additionally, the tumor could invade the skin, the chest wall, the nipple, or spread to the lymph nodes in the neck or chest wall (called internal mammary nodes).
  • Stage IV—Cancer has spread beyond the breast and lymph nodes to other parts of the body.

In addition to staging, other factors play a role in your prognosis, including your general health and age. In a large study, for example, younger women (less than age 40), who were initially diagnosed with Stage I or II breast cancer, had lower survival rates compared to older patients. Researchers are investigating what may account for this unexpected result.1


Breast cancer. National Cancer Institute website. Available at: . Accessed January 27, 2006.

Breast cancer. Womens' website. Available at: . Accessed January 27, 2006.

National Breast Cancer Coalition website. Available at: . Accessed January 27, 2006.

  1. 5/11/2009 DynaMed's Systematic Literature Surveillance : Gnerlich JL, Deshpande AD, Jeffe DB, Sweet A, White N, Margenthaler JA. Elevated breast cancer mortality in women younger than age 40 years compared with older women is attributed to poorer survival in early-stage disease. J Am Coll Surg. 2009;208:341-347.

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