ACR breast density refers to the classification of breast density according to the Breast Imaging Reporting and Data System (BI-RADS) developed by the American College of Radiology (ACR). ACR breast density is classified into four categories: Category A: fatty tissue that represents less than 25% of the breast. Category B: fatty tissue that represents between 25% and 50% of the breast. Category C: fatty tissue that represents between 50% and 75% of the breast. Category D: fat

The BI-RADS breast classification refers to the Breast Imaging Reporting and Data System (BI-RADS) developed by the American College of Radiology (ACR) to standardize the interpretation and reporting of breast imaging test results, such as mammography, ultrasound, and magnetic resonance imaging. The ACR BI-RADS breast classification consists of seven numerical categories ranging from 0 to 6: Category 0: Additional information is needed before a proper assessment can be made.