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Note: In the small subgroups (score of 1 and 12), malignancy risk was based on extrapolation from other data, because of small number. Some US findings (spongiform and micro-calcifications; cystic and micro-calcifications) cannot be simultaneously submitted because these findings did not coexist in our dataset.
†essential data for all cases (the range of diameter is 0.5 - 10 cm).
‡essential data set except for the cases with US findings of cystic, spongiform, or macrocalcifiation.
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