A breast biopsy involves removing a small sample of breast tissue to test for cancer.
A biopsy is the only test that can tell for sure if a shadow or lump is breast cancer. During a breast biopsy, the doctor removes a small amount of tissue from the breast.
There are two main kinds of breast biopsy: core-needle biopsy and open surgical biopsy.
The kind of breast biopsy a doctor recommends may depend on what the shadow or lump looks like on the mammogram. It may also depend on the size of the shadow or lump and where it is located in the breast.
After the biopsy, a doctor will look at the tissue under a microscope. This doctor, called a pathologist, looks for changes in the tissue. The doctor's report will tell if there is cancer or not. It takes about a week to get the report.