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Objectives: The aim of this study was to investigate the diagnostic value of the intravoxel incoherent motion(IVIM)for lung benign and malignant tumors.Methods: IVIM-diffusion weighted imaging(DWI)exams were performed preoperatively on 26 patients with lung cancers and 29 patients with lung benign tumors(BM)from October 2014 to June 2016 in the second affiliated hospital of Fujian medical university.