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Comparison of Assessability Rates of T4 Tumor Invasion into Adjacent Organs.
| US | ||
|---|---|---|
| Assessable | Non‐assessable | |
| T4 (35) | ||
| Pyriform sinus | ||
| Laryngeal cartilage (22) | 7 | 15 |
| Posterior wall | ||
| Laryngeal cartilage (3) | 0 | 3 |
| Postcricoid | ||
| Laryngeal cartilage (5) | 3 | 2 |
| Laryngeal cartilage + thyroid (4) | 4 | 0 |
| Laryngeal cartilage + thyroid + prevertebral fascia (1) | 1 | 0 |
