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Ultrasonographic features of MTC and PTC in collision tumors
| MTC (n = 18) | PTC (n = 15) | P value | |
|---|---|---|---|
| Hypoecho, % (n) | 100 (18) | 100 (15) | - |
| Irregular contour or obscure border, % (n) | 61.1 (11) | 86.7 (13) | 0.134 |
| Calcification, % (n) | 50 (9) | 60 (9) | 0.566 |
| Abundant blood flow signals, % (n) | 50 (9) | 6.7 (1) | 0.009 |
| Aspect ratio > 1, % (n) | 16.7 (3) | 33.3 (5) | 0.418 |
MTC, medullary thyroid carcinoma; PTC, papillary thyroid carcinoma
