Seeing BI-RADS 3 on your breast ultrasound or mammogram report can make you nervous.
Many patients immediately ask:
“Do I have breast cancer?”
or
“Why do I need another ultrasound in six months?”
The good news is that BI-RADS 3 means the finding is probably benign.
It does not mean cancer has been diagnosed.
What Is BI-RADS 3?
BI-RADS stands for Breast Imaging Reporting and Data System (ACR).
A BI-RADS 3 assessment means:
Probably benign.
The chance of cancer is very low (2% or less), but the finding is not considered completely typical enough to be classified as BI-RADS 2.
Because of this, short-term follow-up is recommended instead of immediate biopsy.
Why Is a 6-Month Follow-Up Needed?
A follow-up ultrasound allows the radiologist to confirm that the finding remains stable.
If there is no change over time, it supports the diagnosis of a benign lesion.
Most BI-RADS 3 findings remain stable or even disappear.
Common BI-RADS 3 Findings
Typical examples include:
✔ Small oval solid masses
✔ Probably benign fibroadenomas
✔ Small groups of round calcifications
✔ Focal asymmetry without suspicious features
Do I Need a Biopsy?
Usually, no.
Most patients only need follow-up imaging.
However, if the lesion grows or develops suspicious features during follow-up, a biopsy may then be recommended.
A Sonographer’s Perspective
One of the most common questions I hear is:
“If it’s probably benign, why can’t you call it BI-RADS 2?”
Because medicine values safety.
A short follow-up allows doctors to confirm that the finding truly remains stable.
Key Takeaways
✔ BI-RADS 3 means probably benign.
✔ The chance of cancer is 2% or less.
✔ A 6-month follow-up is recommended.
✔ Most patients do not need an immediate biopsy.
