Relationship between shapes and pathology (n = 165) Shape Benign (%) Malig (%) n (%) p Round 21 (63, 6) 12 (36, 4) 33 (20, 0) 2 = 4, 81 0, 186 Oval 61 (50, 0) 61 (50, 0) 122 (73, 9) Polygon 0 (0, 0) 2 (100, 0) 2 (1, 2) Amorphous 3 (37, 5) 5 (62, 5) 8 (4, 8) Tổng 85 (51, 5) 80 (42, 8) 165 (100, 0) Conclusion: Round have hight benign rate (63, 6%), Polygon or amorphous have hight malignant rate (62, 5% and 100, 0%).