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| Lymph nodes dissected | Patients with cervical lymph node involvement | Patients with thoracic lymph node involvement | Patients with abdominal lymph node involvement | Patients with overall lymph node involvement |
| Lymphovascular and perineural invasion of the primary lesion | ||||
| Present (7) | 0 | 3 | 3 | 5 |
| Absent (24) | 2 | 10 | 7 | 12 |
| Total | 2 | 13 | 10 | 17 |
