Breast imaging-reporting and data system (BI-RADS) assessment category 2

BI-RADS 2 is a benign category in breast imaging reporting and data system. A finding placed in this category should have a 100% chance of being benign. 

Examples of such lesions or findings include:

• calcified fibroadenomas

• multiple secretory calcifications

• fat-containing lesions such as:

  • oil cysts

  • breast lipomas

  • galactoceles

  • mixed density hamartomas

• cutaneous neurofibromas ³: e.g. in neurofibromatosis type I (evidence of sarcomatous change is considered very low)

• intramammary lymph nodes

• breast sebaceous cysts

• simple breast cysts ⁴

• breast implants

Reporting recommendations

Although BI-RADS 1 and BI-RADS 2 both denote an essentially zero chance of malignancy, BI-RADS 1 is used in situations where the breast is completely unremarkable, and BI-RADS 2 is used when the radiologist wants to remark on a benign finding.

Any BI-RADS 2 breast finding is not expected to change over the follow-up interval. The radiologist should mention that it is a definite benign lesion.

Usual screening follow-up is recommended.