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Ultrasound characteristics of suspected primary lesions.
| n (%) | |
|---|---|
| Subsite of primary tumor | |
| BOT | 7 (70) |
| Tonsil | 3 (30) |
| Echogenicity of lesion | |
| Hypoechoic | 9 (90) |
| Isoechoic | 1 (10) |
| Echogenicity of margin | |
| Isoechoic with heterogeneous foci | 1 (10) |
| Hypoechoic | 8 (80) |
| Hyperechoic | 1 (10) |
| Shape of margin | |
| Regular | 3 (30) |
| Irregular | 7 (70) |
| Clarity of margin | |
| Well-circumscribed | 2 (20) |
| Intermediate | 8 (80) |
| Adjacent anatomic site involvement | |
| Yes | 2 (20) |
| No | 8 (80) |
| Lesion crosses midline | |
| Yes | 0 |
| No | 10 (100) |
