Class A (or 1): Fatty; Class B (or 2): Scattered fibroglandular density; Class C (or 3): Heterogeneously dense; Class D (or 4): Extremely dense.
The ACR BI-RADS Atlas (4) is the updated version of the Atlas. BI- RADS® is designed to standardize breast imaging reporting and.
Breast Density classifications according to the BI-RADS lexicon. Women with ‘dense‘ breasts have a higher percentage of fibrous and glandular tissue and less fat tissue. (Fibroglandular parenchyma, basically means breast tissue).