What does BI-RADS 0 on my mammogram mean?

Question

Hi doctor,

On diagnosis, my reports show that my breasts are heterogeneously dense, which may obscure small masses. There is a questionable asymmetry in the lateral left breast at posterior depth seen on the CC projection. There is no evidence of suspicious calcifications or other abnormal findings in the left breast. On the right breast, there is no evidence of suspicious masses, calcifications, or other abnormal findings in the right breast.

BI-RADS category (left): 0 - Incomplete: Needs additional imaging evaluation.
BI-RADS category (right): 1 - Negative.

Ultrasound is recommended for the left breast. Additional projections are recommended for the left routine screening mammogram and after one year, for the right.

Please explain

Answer 1

Hi,

Welcome to icliniq.com.

I can understand your concern.

Your report (attachment removed to protect the patient's identity) shows that your breasts are heterogeneously dense. This is common and not abnormal, but it can make mammograms harder to read because dense tissue can hide small findings. Dense tissue itself is not cancer, just a tissue type.

Left breast (the area of focus): There is a questionable asymmetry seen only on one view, cranial-caudal (CC view). No suspicious calcifications or definite masses were seen. It is only seen on one image; the radiologist cannot fully characterize it yet. That is why it is labeled BI-RADS (breast imaging reporting and data system) 0, indicating it is incomplete. This does not mean cancer. It simply means more images are needed to be fully sure.

The right breast is completely normal, BI-RADS 1, which means it is negative. Routine screening in one year is appropriate.

For the left breast, they want:

Additional mammogram views (special angles to see if the asymmetry disappears).
Targeted ultrasound.

This is extremely common, especially in people with dense breasts. Many times, the asymmetry turns out to be overlapping tissue or fibroglandular tissue, similar to what you had before, and how your prior history fits in.

You mentioned a questionable area four years ago. Follow-up ultrasound showed fibrous intermammary gland. That history is actually reassuring. You have had a similar scenario before It resolved as benign breast tissue. Dense or fibroglandular breasts often behave this way on imaging.

There is no suspicious mass, no concerning calcifications, no architectural distortion, and no urgent or emergent concern. If this were worrisome, the report would look very different (BI-RADS 4 or 5).

You will be contacted to schedule imaging. Ultrasound and additional views are quick and painless. Many people get the same-day benign result after the follow-up.

This report reads as probably benign tissue obscured by density. Let’s take a closer look to be certain. You are doing everything right by following up, and nothing here screams danger.

If you want, I can help you prepare questions for the imaging appointment, explain what specific outcomes after the ultrasound might mean, and walk you through BI-RADS categories so future reports feel less scary.

I hope this information is helpful to you.

Thank you.

Answer 2

Hi,

Welcome back to icliniq.com.

I can understand your concern.

If you have any further queries, please do not hesitate to contact me.

I hope this information is helpful to you.

Thanks.