Correlation between high-resolution computed tomography findings and IASLC/ATS/ERS classification of small lung adenocarcinomas in Japanese patients.

7543 Background: Small pulmonary nodule detection rates have increased owing to computed tomography (CT) screening of lung cancer, and new image guided-bronchoscopy techniques have been developed to improve diagnostic yield. Additionally, limited surgical resection for small peripheral lung adenocarcinomas has been reported. Recently, the IASLC/ATS/ERS classification emphasized the prognostic significance of histologic subtypes. We evaluated the correlation between high-resolution CT (HRCT) findings and this classification of small lung adenocarcinomas. Methods: We reviewed the data of 220 consecutive lung adenocarcinoma ( ≤ 3 cm) patients who received segmentectomy or more extended resection with lymph node dissection in our hospital. From the HRCT findings, the tumors were classified as pure solid, part-solid, or pure ground glass opacity (GGO) nodules. Pathologic tumor invasiveness (pTI) was evaluated by the degree of vascular invasion, lymphatic permeation, or visceral pleural invasion. Results: The t...