Oct. 21, 2019&mdash;It's not unusual for women who've had a mammogram to be called back for a repeat test because of a suspicious result. 
You may be understandably frightened if this happens to you. But know this important fact: Most callbacks do not result in a breast cancer diagnosis. 
Often, abnormal areas on a mammogram turn out to be a noncancerous cyst or tumor. Also, many women have dense breast tissue, which might make a mammogram initially hard to read. 
To help make sure a suspicious finding on a mammogram is not cancer, your doctor may want you to come back and have more tests, such as: 
Another mammogram. A diagnostic mammogram is just like a screening mammogram, except that it may focus just on the suspicious area. 
An ultrasound test. This test, which uses sound waves instead of x-rays to examine the breast, can help distinguish a harmless fluid-filled cyst from a solid mass, which may be cancer. 
An MRI scan. This test takes highly detailed pictures of the breast. 
A biopsy. After having one or more of the other follow-up imaging tests, your doctor may order a biopsy if there's still a chance the abnormal area could be cancer. For a biopsy, a tissue sample from the breast is examined under a microscope. 
It can take a few days or longer to learn the results of a biopsy. This can be an anxious time. Try not to worry too much. Most women who have a breast biopsy turn out not to have cancer. You and your doctor are doing the right thing by making sure all is OK.

What to know if you're called back for a 2nd mammogram

This happens to a lot of women, and the results are usually fine.