Table 2. CT characteristics of the GGNs without 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) | 7.80±3.12 | 7.93±2.90 | – |
| CT value (HU) | −560.88±152.53 | −569.38±154.93 | – |
| Distribution | – | ||
| Upper and middle lobe | 27 (77.1) | 27 (77.1) | |
| Lower lobe | 8 (22.9) | 8 (22.9) | |
| CT pattern | >0.99† | ||
| Pure GGN | 19 (54.3) | 19 (54.3) | |
| PSN | 16 (45.7) | 16 (45.7) | |
| Shape | – | ||
| Regular | 35 (100) | 35 (100) | |
| Irregular | 0 (0) | 0 (0) | |
| Boundary | 0.49† | ||
| Ill-defined | 33 (94.3) | 35 (100) | |
| Well-defined | 2 (5.7) | 0 (0) | |
| GGNs with other signs | 2 (5.7) | 2 (5.7) | >0.99† |
| Spiculation | 1 (50.0) | 1 (50.0) | |
| Vacuole sign | 1 (50.0) | 1 (50.0.) |
Data are presented as n (%) or mean ± standard deviation. †, calculated with the Pearson Chi-squared test. – indicates no statistical data. CT, computed tomography; GGNs, ground-glass nodules; HU, Hounsfield unit; PSN, part-solid nodules.