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Table 1 Current study: characterization of solid breast nodules

From: Sonographic evaluation of solid breast nodules

  Benign histology Malignant histology All biopsies
Negative US (BIRADS 2, 3) 245 (true negatives) 1 (false negatives) 246
Positive US (BIRADS 4a, 4b, 5) 559 (false positives) 406 (true positives) 965
Total 804 407 1211
  1. Sensitivity = 406/407 = 99.8%. Negative predictive value = 245/246 = 99.6%. Specificity = 245/804 = 30.5%. Positive predictive value = 406/965 = 42.1%. Accuracy = (245 + 406)/1211 = 53.8%.