Visualization of soft tissues in neck with ultrasound imaging.
| Soft Tissue | Cases Visualized on Ultrasonography | Proportion (95% CI)a | ||
| Right | Left | Right | Left | |
| Esophagus | 7/10 | 10/10 | 70% (40%–89%) | 100% (72%–100%) |
| Longus colli muscle | 10/10 | 10/10 | 100% (72%–100%) | 100% (72%–100%) |
| C2 | 6/10 | 6/10 | 60% (31%–83%) | 60% (31%–83%) |
| C3 | 10/10 | 10/10 | 100% (72%–100%) | 100% (72%–100%) |
| C4 | 10/10 | 10/10 | 100% (72%–100%) | 100% (72%–100%) |
| C5 | 10/10 | 10/10 | 100% (72%–100%) | 100% (72%–100%) |
| C6 | 10/10 | 10/10 | 100% (72%–100%) | 100% (72%–100%) |
| C7 | 9/10 | 7/10 | 90% (60%–98%) | 70% (40%–89%) |
↵a The proportion (Wilson 95% CI) of cases with successful visualization of the target structure.