Table 2. Internal and peripheral characteristics of 80 pGGNs on CT findings.
| CT findings | AAH, n=33 (%) | AIS, (n=47) (%) | P value |
|---|---|---|---|
| Mean CT value (HU) | 0.544 | ||
| −200 to −300 | 0 (0) | 1 (2.1) | |
| −301 to −400 | 1 (3.0) | 2 (4.3) | |
| −401 to −500 | 2 (6.1) | 5 (10.6) | |
| −501 to −600 | 13 (39.4) | 15 (31.9) | |
| −601 to −700 | 14 (42.4) | 18 (38.3) | |
| −701 to −800 | 3 (9.1) | 6 (12.8) | |
| Density uniformity | 7 (21.2) | 12 (25.5) | 0.655 |
| Solitary lesion | 29 (87.9) | 33 (70.2) | 0.062 |
| Clear rim | 32 (97.0) | 40 (85.1) | 0.173 |
| Regular shape | 27 (81.8) | 34 (72.3) | 0.327 |
| Vacuole sign | 0 (0) | 9 (19.1) | 0.021 |
| Lobulation | 3 (9.1) | 10 (21.3) | 0.146 |
| Spiculation | 5 (15.2) | 4 (8.5) | 0.571 |
| Pleural indentation | 3 (9.1) | 7 (14.9) | 0.668 |
| Air bronchogram | 0 (0) | 3 (6.4) | 0.378 |
pGGN, pure ground-glass nodule; AAH, atypical adenomatous hyperplasia; AIS, adenocarcinoma in situ.