Breast Cancer: Diagnosis
How is breast cancer diagnosed?
If your healthcare provider thinks you might have breast cancer, you will need certain
exams and tests to be sure. Diagnosing breast cancer starts with your healthcare provider
asking you questions. He or she will ask you about your health history, your symptoms,
risk factors, and family history of disease. Your healthcare provider will also give
you a physical exam, including an exam of your breasts.
What tests might I need?
You may have one or more of the following tests:
Nipple discharge exam
Mammogram. A mammogram is an X-ray of the breast. It’s done to look for and learn more about
unusual breast changes. These may include a lump, pain, nipple thickening or discharge,
or a change in breast size or shape. A screening mammogram checks for changes. A diagnostic
mammogram uses more pictures to look more closely at changes that were seen on a screening
Ultrasound. This test uses high-frequency sound waves to make images of body tissues on a computer
screen. This exam is often used along with a mammogram.
Breast magnetic resonance imaging (MRI). This test uses large magnets and a computer to make detailed images of tissues inside
A biopsy removes tissue or cells from the breast to check them under a microscope.
A biopsy is the only way to know if cells are cancer.
A breast biopsy may be done with local or general anesthesia. Local anesthesia uses
medicine to numb the area of the breast where a needle will be inserted. General anesthesia
uses medicines to put you into a deep sleep while the biopsy is done. There are several
types of breast biopsy. The type of biopsy done will depend on the location and size
of the breast lump or change.
Types of breast biopsy include:
Fine needle aspiration (FNA) biopsy. A very thin needle is placed into the lump or changed area to remove a small sample
of fluid or tissue. This type of biopsy may be used to help find out if a breast change
is a fluid-filled sac that's usually not cancer (a cyst) or a solid lump.
Core needle biopsy. A large needle is guided through the skin into a lump or other area to remove small
cylinders of tissue (cores).
Surgical biopsy. This is also called an open biopsy. A surgeon removes part or all of a lump or other
area through a cut (incision) into the breast. There are 2 types of surgical biopsy.
During an incisional biopsy, a small part of the lump is removed. During an excisional
biopsy, the entire lump is removed. If the lump is very small and deep and hard to
locate, the wire localization method may be used during surgery. This is when an X-ray
is used to put thin wire through your skin and into the lump. The surgeon then follows
this wire to help locate the breast lump.
Lymph node biopsy. If lymph nodes under the armpit are swollen or look enlarged on imaging tests, the
doctor will want to check them for cancer cells. A needle biopsy may be done to take
out and check cells from the lymph node.
Special tools and methods may be used to guide the needles and to help with biopsy
procedures. These include:
Stereotactic biopsy. This method finds the exact location of a breast lump or area by using a computer
and mammogram results to create a 3-D picture of the breast. A sample of tissue is
removed with a needle.
Vacuum-assisted biopsy. A small cut is made in the skin, and a thin, needle-like, hollow tube is inserted
into the breast lump or mass. An imaging test is used to guide the tube to the right
place. The breast tissue is gently suctioned into the tube, and a small rotating knife
inside the tube removes the tissue.
Ultrasound-guided biopsy. This method uses a computer and a small handheld device (transducer) that sends out
ultrasonic sounds waves to create images of the breast lump or mass. The images help
to guide the needle biopsy.
Nipple discharge exam
Fluid may be collected from nipple discharge and then sent to the lab to look for
cancer cells. Most nipple secretions are not cancer. An injury, infection, or noncancer
(benign) tumor may cause discharge.
Getting your test results
When your healthcare provider has the results of your biopsy and other tests, he or
she will contact you with the results. Your provider will talk with you about other
tests you may need if breast cancer is found. Make sure you understand the results
and what follow-up you need.