Kaiser Score with Breast MRI Improves Sensitivity Over BI-RADS for Unclear Mammography/Ultrasound

In a small study of 99 women with BI-RADS 0 or 4 mammography/ultrasound, breast MRI Kaiser score (>5) had 97% sensitivity and 98.3% NPV for malignancy, vs 60.6% and 83.5% with MRI BI-RADS category 4. One cancer scored 5, so score cannot safely exclude malignancy.

• Kaiser score AUC 97.7% vs MRI BI-RADS 87.8% for predicting malignancy.
• MRI BI-RADS maintained 100% specificity, outperforming Kaiser score’s 87.9%, but Kaiser score had higher negative predictive value.
• Authors caution: Kaiser score should support, not replace, biopsy decisions; one detected malignancy fell below the positive threshold (score 5).

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