330 chapter 4 Table 19. Benign and malignant diagnosis per group [18F]FDG-PET/CT-driven group diagnostic surgery group n = 132 n = 91 n = 41 p Malignant 20 (22%) 5 (12%) 0.18 Benign 71 (78%) 36 (88%) Table 20. Therapeutic yield after one year of follow-up for differentiation between strictly benign and malignant nodules [18F]FDG-PET/CT-driven group n=91 diagnostic surgery group n=41 n % (95% CI) n % (95% CI) p Beneficial management 45 / 91 49% (39%-60%) 6 / 41 15% (6%-29%) <0.001a Surgery for malignant nodule 20 / 91 22% (14%-32%) 5 / 41 12% (4%-26%) 0.18a Surveillance for benign nodule 25 / 91 27% (19%-38%) 1 / 41 2% (0%-13%) 0.001a Unbeneficial management Surgery for benign nodule 46 / 91 51% (40%-61% 35 / 41 85% (71%-94%) <0.001a Surveillance for malignant nodule 0 / 91 0% (0%-4%) 0 / 41 0% (0%-9%) n.a. Avoided surgery in benign nodules 25 / 71 35% (24%-47%) 1 / 36 3% (0%-15%) <0.001a CI=confidence interval. n.a.=not applicable. a: Pearson’s chi-squared test.
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