We evaluated totally 67 patients having primary lung cancer underwent surgical procedures between January 1990 - March 1997 in our institution. The curative resection procedures were indicated in the stages up to the IIIb. The operative choices were lobectomy (35 %), bilobectomy (4 %), pneumonectomy (35 %), excisional biopsy + wed %), debulking (4 %) and metastathectomy (9 %). Mediastinal lymph node dissection was routinely performed in the resection procedures. Total mortality rate was 25 % with the hospital mortality of 2 patients (3 %). Significant differentiation was noticed in the staging ratios between the pre and postoperative evaluation. In order to choose the most appropriate therapeutic plan and determining the prognosis, the exact stage must be detected by the aid of mediastinal lymph node dissection.