F-078GRADE OF BIOLOGICAL MALIGNANCY AND TREATMENT STRATEGY OF LUNG CANCER IN WHICH IT WAS DIFFICULT TO MEASURE THE SIZE OF GROUND-GLASS OPACITY ON THIN-SECTION COMPUTED TOMOGRAPHY (LUNG CANCER WITH SCATTERED CONSOLIDATION)

Objectives The size of ground-glass opacity (GGO) on thin-section computed tomography (CT) is one of the most favourable prognostic factors in lung cancer. We reported lung cancer with scattered consolidation (LCSC), which was defined as lung cancer in which it was difficult to measure GGO. However details on the LCSC remain unknown. Methods A retrospective study was conducted on consecutive 604 patients with resected lung cancer of clinical stage IA between January 2009 and October 2012. All patients underwent preoperative CT and authors reviewed radiological findings for all cohorts. LCSCs were selected and lung cancers based on the status of GGO were divided into four categories as follows: A, GGO group (GGO >0.5); B, LCSC (GGO unmeasurable); C, Part Solid (GGO ≤0.5, >0); D, Pure Solid (GGO = 0). To elucidate their characteristic findings, we investigated clinicopathological features (SUVmax of PET-CT, tumour marker and pathological findings). To compare two or more factors, chi-square test was used for statistical analysis. A P-value of