Fig. 2

Image features of malignant GGNs in Axial HRCT. (A) Adenocarcinoma in a 55-year-old male. HRCT shows a 15 mm focal ground-glass nodule with vacuole sign sign and intra-nodular vessel sign in the left upper lobe. (B) Adenocarcinoma in a 57-year-old female. HRCT shows a 15 mm focal ground-glass nodule with air bronchogram sign and intra-nodular vessel sign in the right upper lobe. (C) Adenocarcinoma in a 67-year-old male. HRCT shows a 18 mm focal ground-glass nodule with intra-nodular vessel sign in the left lower lobe. (D) Adenocarcinoma in a 60-year-old male. HRCT shows a 18 mm focal ground-glass nodule with vacuole sign sign and intra-nodular vessel sign in the right lower lobe