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Upstaging based on lymph node involvement, n = 147 patients
| After endosonography (n = 147 patients) | After cervical mediastinoscopy (n = 124 patientsa) | After thoracotomy (n = 123 patientsb) | |
|---|---|---|---|
| N0/N1 | 147 | 110 | 109 |
| N2 | – | 11 | 14 |
| N3 | – | 3 | – |
aTwenty-three patients did not undergo a cervical mediastinoscopy.
bTwenty-four patients did not undergo a thoracotomy (14 patients because of a positive mediastinoscopy).
