Staging lung cancer based on CT scan: 24 cases (22%) IA (T1a, N0; T1b, N0), 42 cases (38.5%) IB (T2a, N0); 24 cases (22%) IIA (T1a, N1; T1b, N1; T2a, N1); 19 cases (17.5%) IIIA (T1a, N2; T1b, N2; T2a, N2).