Preoperative factors associated with pleural, lymphatic and vascular invasion in small adenocarcinomas (≤3 cm).

Logistic regression test (Univariate analyses). LD: diameter by lung window setting, MD: diameter by mediastinal window setting, TDR: tumour disappearance ratio (TDR = 1− MD/LD), CEA: carcinoembryonic antigen, cN: preoperative nodal status, CI: confidence interval, ly: lymphatic vessels, v: vascular vessels, pl: pleura. Preoperative factors associated with pleural, lymphatic and vascular invasion in small adenocarcinomas (≤3 cm).