Breast imaging-reporting and data system (BI-RADS) assessment category 2
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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:
multiple secretory calcifications
fat-containing lesions such as:
mixed density hamartomas
cutaneous neurofibromas 3: e.g. in neurofibromatosis type I (evidence of sarcomatous change is considered very low)
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.
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