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Table 3 Radiological characteristics of benign or malignant lesions

From: Contrast-enhanced spectral mammography: successful initial clinical institute experience

Variable   Final diagnosis χ2(df,1) p-value
Benign (n = 37) Malignant (n = 86)
n % n %
Number of lesions by SMG Nil 6 16.2% 0 0.0% 14.506 < 0.001*
Single lesion 31 83.8% 65 75.6%
2 lesions 0 0.0% 12 14.0%
3 lesions 0 0.0% 5 5.8%
4 lesions 0 0.0% 4 4.7%
BIRADS class by SMG BIRADS 1 4 10.8% 3 3.5% 31.321 < 0.001*
BIRADS 2 0 0.0% 0 0.0%
BIRADS 3 15 40.5% 8 9.3%
BIRADS 4 16 43.2% 24 27.9%
BIRADS 5 1 2.7% 3 3.5%
BIRADS 6 1 2.7% 48 55.8%
Number of enhanced lesions by CESM Nil 14 37.8% 8 9.3% 22.991 < 0.001*
Single lesion 22 59.5% 39 45.3%
2 lesions 0 0.0% 12 14.0%
3 lesions 1 2.7% 21 24.4%
4 lesions 0 0.0% 5 5.8%
5 lesions 0 0.0% 1 1.2%
Grade of enhancement No enhancement 16 43.2% 8 9.3% 25.294 < 0.001*
Minimal 0 0.0% 12 14.0%
Mild 10 27.0% 1 1.2%
Moderate 8 21.6% 6 7.0%
Marked 3 8.1% 59 68.6%
BIRADS class by CESM BIRADS 1 0 0.0% 0 0.0% 71.990 < 0.001*
BIRADS 2 28 75.7% 1 1.2%
BIRADS 3 1 2.7% 1 1.2%
BIRADS 4 7 18.9% 30 34.9%
BIRADS 5 0 0.0% 8 9.3%
BIRADS 6 1 2.7% 46 53.5%
BIRADS class by SMG Probably benign (BIRADS 1–3) 19 51.4% 11 12.8% 20.859 < 0.001§
Probably malignant BIRADS 4–6 18 48.6% 75 87.2%
BIRADS class by CESM Probably benign (BIRADS 1–3) 29 78.4% 2 2.3% 79.375 < 0.001§
Probably malignant BIRADS 4–6 8 21.6% 84 97.7%
Marked enhancement No to moderate enhancement 34 91.9% 27 31.4% 37.874 < 0.001§
Marked enhancement 3 8.1% 59 68.6%
  1. Data are number (n) and percentage (%). χ2, chi-squared statistic; df,1
  2. *Pearson chi-squared test. §Chi-squared test for trend