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Table 2 Comparison of CT features of SPNs

From: Differentiation of primary lung cancer from solitary lung metastasis in patients with colorectal cancer: a retrospective cohort study

  LC (n = 70) LM (n = 129) P value
Size (mm) 19.1 ± 5.5 14.9 ± 6.2 < 0.001
Cranio-caudal location    0.188
 Upper 35 (50.0) 52 (40.3)  
 Non-upper 35 (50.0) 77 (59.7)  
Axial location    0.105
 Central 12 (17.1) 12 (9.3)  
 Peripheral 58 (82.9) 117 (90.7)  
Margina    < 0.001
 Smooth 7 (10) 54 (41.9)  
 Lobulated 30 (42.9) 68 (52.7)  
 Spiculated 33 (47.1) 7 (5.4)
Density    < 0.001
 Solid 47 (67.1) 128 (99.2)  
 Sub-solid 23 (32.9) 1 (0.8)  
Air bronchogram 30 (42.9) 7 (5.4) < 0.001
Cavitation 13 (18.6) 19 (14.7) 0.296
Pleural tags 41 (58.6) 25 (19.4) < 0.001
Pleural abutment 32 (45.7) 53 (41.1) 0.528
Background emphysema 18 (25.7) 13 (10.2) 0.004
  1. Values in parentheses are percentages. Values are presented as mean ± standard deviation where applicable. Size is a quantitative feature. Cranio-caudal location, axial location, margin, density, air bronchogram, cavitation, pleural tags, pleural abutment, and background emphysema are qualitative features
  2. aPost hoc analysis was performed to compare the proportion of margin of SPNs between the two groups, smooth vs. lobulated, P = 0.005; smooth vs. spiculated, P < 0.001; lobulated vs. spiculated, P < 0.001. Significance level of 0.0167 takes into account the Bonferroni’s correction for post hoc analysis (0.05/3). Note: significant P values are shown in bold
  3. CT computed tomography, LC lung cancer, LM lung metastases, SPNs solitary pulmonary nodules