Table 1. CT characteristics of the GGNs with progressive changes on the initial and latest preoperative CT images.
| Characteristics | Initial CT scan (n=35) | Latest preoperative CT scan (n=35) | P value |
|---|---|---|---|
| Size (mm) | 9.90±4.41 | 11.76±6.03 | – |
| CT value (HU) | −539.66±171.95 | −437.29±220.05 | – |
| Volume (mm3) | 758.90±1,170.98 | 1,380.52±2,705.68 | – |
| Distribution | – | ||
| Upper and middle lobe | 21 (60.0) | 21 (60.0) | |
| Lower lobe | 14 (40.0) | 14 (40.0) | |
| CT pattern | 0.81† | ||
| Pure GGN | 18 (51.4) | 16 (45.7) | |
| PSN | 17 (48.6) | 19 (54.3) | |
| Shape | >0.99† | ||
| Regular | 27 (77.1) | 27 (77.1) | |
| Irregular | 8 (22.9) | 8 (22.9) | |
| Boundary | >0.99† | ||
| Ill-defined | 26 (74.3) | 25 (71.4) | |
| Well-defined | 9 (25.7) | 10 (28.6) | |
| GGNs with other signs | 9 (25.7) | 13 (37.1) | 0.057† |
| Lobulation | 4 (44.4) | 6 (46.2) | |
| Spiculation | 1 (11.1) | 1 (7.7) | |
| Vacuole sign | 1 (11.1) | 1 (7.7) | |
| Bronchial cut-off | 2 (22.2) | 2 (15.4) | |
| Air bronchogram | 1 (11.1) | 2 (15.4) | |
| Pleural indentation sign | 0 | 1 (7.7) |
Data are presented as n (%) or mean ± standard deviation. †, calculated with the Pearson Chi-squared test. – indicated no statistical data. CT, computed tomography; GGNs, ground-glass nodules; HU, Hounsfield unit; PSN, part-solid nodules.