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Receiver operating characteristic analysis for 2 groups: nodules with adenocarcinoma in situ (n = 22) and nodules with minimally invasive adenocarcinoma (MIA) or invasive adenocarcinoma (IVA) (n = 26). Cutoff value of solid portion on thin-section CT was more than 5.3 mm to predict the histological diagnosis (MIA or IVA) based on the pathological invasiveness (P < 0.0001): sensitivity, 92.3%; specificity, 90.9%.
