Table 1.
Rate of Malignancy by Thyroid Nodule Echogenic Foci Type
| Total (n = 390) | Benign (n = 136) | Malignant (n = 254) | P value | |
|---|---|---|---|---|
| Type 1 | 207 (53.1) | 54(26.1) | 153 (73.9) | < 0.001 |
| Type 2 | 54 (13.8) | 12(22.2) | 42(77.8) | 0.452 |
| Type 3 | 94 (24.1) | 41 (43.6) | 53 (56.4) | 0.041 |
| Type 4 | 27 (6.9) | 16 (59.3) | 11 (40.7) | 0.006 |
| Type 5 | 21(5.4) | 14 (66.7) | 7 (33.3) | 0.002 |
| Type 6 | 41 (10.5) | 11 (26.8) | 30 (73.2) | 0.253 |
Data indicate the number of lesions
Numbers in parentheses indicate percentages
Type 1 = Punctate echogenic foci (≤ 1 mm) with or without posterior shadowing
Type 2 = Punctate echogenic foci with comet-tail artifact
Type 3 = Large echogenic foci (> 1 mm) without shadowing
Type 4 = Macrocalcification (defined as large echogenic foci (> 1 mm) with shadowing)
Type 5 = Peripheral curvilinear or eggshell echogenic foci with or without shadowing
Type 6 = Nodules with more than one type of echogenic foci