Table 3. The morphological characteristics of the 55 pGGNs classified into IA vs. AIS or MIA.
| Characteristics | AIS or MIA (n=40), n (%) | AIS (n=21), n (%) | MIA (n=19), n (%) | IA (n=15), n (%) | P values* |
|---|---|---|---|---|---|
| Bubble lucency | 1 (2.5) | 1 (4.8) | 0 (0) | 1 (6.7) | 0.475 |
| Lobulation | 39 (97.5) | 21 (100.0) | 18 (94.7) | 15 (100.0) | 0.727 |
| Pleural retraction | 6 (15.0) | 2 (9.5) | 4 (21.1) | 7 (46.7) | 0.020 |
| Bronchi in pGGNs | 0.255 | ||||
| Type I | 8 (20.0) | 2 (9.5) | 6 (31.6) | 6 (40.0) | |
| Type II | 7 (17.5) | 4 (19.0) | 3 (15.8) | 3 (20.0) | |
| Type III | 25 (62.5) | 15 (71.4) | 10 (52.6) | 6 (40.0) | |
| Vessels in pGGNs | 0.516 | ||||
| Type I | 2 (5.0) | 2 (9.5) | 0 (0) | 0 (0) | |
| Type II | 17 (42.5) | 11 (52.4) | 6 (31.6) | 3 (20.0) | |
| Type III | 5 (12.5) | 2 (9.5) | 3 (15.8) | 2 (13.3) | |
| Type IV | 16 (40.0) | 6 (28.6) | 10 (52.6) | 10 (66.7) |
*, P values for comparison between IA and AIS or MIA. IA, invasive adenocarcinoma; MIA, minimally IA; AIS, adenocarcinoma in situ; pGGN, pure ground-glass nodule.