Characteristics margin of pulmonary nodules (n=165) Margin n benign (%) Mal (%) Sum (%) 13 Smooth 22 20 (90, 9) 2 (9, 1) 13, 4 Irregular 48 40 (83, 3) (16, 7) 29, 1 Lobulated 1 0 1 (100, 0) 0, 6 Spiculated 1 0 1 (100, 0) 0, 6 Combine many features Irregular + Spiculated 84 23 (27, 4) 61 (72, 6) 51, 2 Irregular + Lobulated 3 1 (33, 3) 2 (66, 7) 1, 8 Lobulated + Smooth 1 1 (100, 0) 0 0, 6 Lobulated + Irregular + Spiculated 5 0 5 (100, 0) 3, 0 Tổng 165 85 (51, 5) 80 (48, 5) 100, 0 Conclusion: Majority of irregular + spiculated margin nodules are malignant (72, 6%), nodules are smooth, most benign (90, 9%).