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

•The HRCT findings correlated with the IASLC/ATS/ERS classification.•Most pure-solid tumors had PIF or lymph node metastasis.•In part-solid tumors, the C/T ratio and consolidation size predicted malignancy.•All pure GGO nodules were pathologically diagnosed as NMIADs or lepidic-predominant adenocarcinoma.