Average diameter of benign and malignant nodules according to Pathology (n = 165) Diameter (mm) Min Max Average p Benign (n=85) 8 22 18, 4 ± 5, 4 t-test 0, 004 Malignant (n=80) 13 29 22, 6 ± 4, 1 Sum (n=165) 8 29 20, 4 ± 5, 2 Conclusion: Average diameter of malignant nodules bigger than benign nodules, p < 0, 05.