PurposeThe purpose of this study was to evaluate the correlation between histological invasiveness and the computed tomography (CT) value and size in pure ground-glass nodules (GGNs) to determine optimal “follow-up or resection” strategies.MethodsBetween 2001 and 2014, 78 resected, pure GGNs were retrospectively evaluated. The maximum diameter and CT value of pure GGNs were measured using a computer graphics support system.ResultsAll GGNs with a maximum diameter ≤10 mm and CT value ≤−600 Hounsfield units (HU) were considered to be noninvasive lesions, while 21 of 26 (81 %) with a maximum diameter >10 mm and CT value >−600 HU were considered to be invasive lesions. With respect to the correlation between each histological type and pure GGN with a maximum diameter ≤10 mm and CT value ≤−600 HU, the specificity was 90 % and the sensitivity and negative predictive value were both 100 % in atypical adenomatous hyperplasia (AAH), while the specificity was 58 % and the sensitivity and positive predictive value were 0 % in minimally invasive and invasive adenocarcinoma.ConclusionPure GGNs with a maximum diameter of ≤10 mm and CT value of ≤−600 HU are nearly always pre-invasive lesions; therefore, surgery should be carefully selected in such patients.

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: It is speculated that the advantage of wedge bronchoplastic lobectomy lies in the reduction in the incidence of major anastomotic complications. On the other hand, wedge bronchoscopic lobectomy can result in kinking at the anastomosis site. This study was performed to evaluate the operative outcomes and the postoperative endoscopic ndings for wedge resection of the bronchus. From 2004 to 2012, nine patients underwent wedge bronchoplastic lobectomy for lung carcinoma. We evaluated the angles of the wedge and the distance of the preserved parts to the cut line of the bronchus the so-called bronchial bridge . There were six right upper lobectomies, two middle and lower lobectomies, and one left lower lobectomy. Regarding bronchoscopic ndings, ve patients who underwent right upper lobectomy showed bulging into the bronchial lumen. There were no anastomotic strictures. Intraoperatively it was noted in these ve patients that the bronchial bridge tended to be relatively long and / or the angle of the wedge resection tended to be relatively wide. To prevent bulging into the bronchial lumen after right upper wedge bronchoplastic lobectomy, bronchial wedge excisions should be shaped in order to reduce the length of the bronchial bridge.