Table 4 Comparison of each US feature of 1399 thyroid nodules excluding thyroid nodules with cytologic results of lymphocytic thyroiditis according to underlying echogenicity
| Â | Total | Malignant | Benign | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Heterogeneous echogenicity | Homogeneous echogenicity | P-value | Heterogeneous echogenicity | Homogeneous echogenicity | P-value | Heterogeneous echogenicity | Homogeneous echogenicity | P-value |
Total number | 280 | 1119 | Â | 68 | 257 | Â | 212 | 862 | Â |
Echogenicity | Â | Â | 0.209 | Â | Â | 0.174 | Â | Â | 0.366 |
  Hyper/isoechogenicity | 114 (40.7) | 520 (46.5) |  | 3 (4.4) | 28 (10.9) |  | 111 (52.4) | 492 (57.1) |  |
  Hypoechogenicity | 152 (54.3) | 543 (48.5) |  | 56 (82.4) | 186 (72.4) |  | 96 (45.3) | 357 (41.4) |  |
  Marked hypoechogenicity | 14 (5.0) | 56 (5.0) |  | 9 (13.2) | 43 (16.7) |  | 5 (2.4) | 13 (1.5) |  |
Margin | Â | Â | 0.012 | Â | Â | 0.314 | Â | Â | 0.007 |
  Well circumscribed | 182 (65.0) | 813 (72.7) |  | 12 (17.6) | 60 (23.3) |  | 170 (80.2) | 753 (87.4) |  |
  microlobulated or irregular | 98 (35.0) | 306 (27.3) |  | 56 (82.4) | 197 (76.7) |  | 42 (19.8) | 109 (12.6) |  |
Calcifications | Â | Â | 0.728 | Â | Â | 0.986 | Â | Â | 0.613 |
  Microcalcifications | 40 (14.3) | 140 (12.5) |  | 29 (42.7) | 108 (42.0) |  | 11 (5.2) | 32 (3.7) |  |
  Macrocalcifications | 37 (13.2) | 149 (13.3) |  | 9 (13.2) | 36 (14.0) |  | 28 (13.2) | 113 (13.1) |  |
  No calcifications | 203 (72.5) | 830 (74.2) |  | 30 (44.1) | 113 (44.0) |  | 173 (81.6) | 717 (83.2) |  |
Shape | Â | Â | 0.306 | Â | Â | 0.790 | Â | Â | 0.124 |
  Wider than tall | 217 (77.5) | 898 (80.3) |  | 29 (42.6) | 105 (40.9) |  | 188 (88.7) | 793 (92.0) |  |
  Taller than wide | 63 (22.5) | 221 (19.7) |  | 39 (57.4) | 152 (59.1) |  | 24 (11.3) | 69 (8.0) |  |