Table 3. STAS with radiological features.
| Characteristics | STAS– | STAS+ | P value |
|---|---|---|---|
| Number of patients, n (%) | 679 (89.1) | 83 (10.9) | |
| Tumor location, n (%) | |||
| Left | 297 (43.7) | 40 (48.2) | 0.441 |
| Right | 382 (56.3) | 43 (51.8) | |
| Upper | 438 (64.5) | 45 (54.2) | 0.125 |
| Middle | 46 (6.8) | 5 (6.0) | |
| Lower | 195 (28.7) | 33 (39.8) | |
| Peripheral | 664 (97.8) | 80 (96.4) | 0.426 |
| Central | 15 (2.2) | 3 (3.6) | |
| CT features, n (%) | |||
| Cavitation | 54 (8.0) | 12 (14.5) | 0.047* |
| Lobulation | 481 (70.8) | 70 (84.3) | 0.009* |
| Spiculation | 420 (61.9) | 56 (67.5) | 0.319 |
| Pleura indentation | 324 (47.7) | 47 (56.6) | 0.125 |
| Air bronchogram | 72 (10.6) | 20 (24.1) | <0.001* |
| Vascular convergence | 606 (89.2) | 81 (97.6) | 0.016* |
| Maximum tumor diameter (mm) | 14.9 (10.7, 20.0) | 18.1 (15.0, 21.2) | <0.001* |
| Maximum solid component diameter (mm) | 5.0 (0, 14.7) | 15.0 (7.9, 19.1) | <0.001* |
| Maximum tumor area (mm2) | 94.5 (45.1, 168.8) | 136.8 (81.8, 191.4) | <0.001* |
| CTR | 0.36 (0, 0.91) | 0.90 (0.54, 1.00) | <0.001* |
| TDR | 1.00 (0.53, 1.00) | 0.45 (0.21, 0.95) | <0.001* |
| CT value (Hu) | –414 (–599, –84) | –63 (–299, –9) | <0.001* |
*, the results were significantly different, which means the P value is less than 0.05. STAS, spread through air space; CT, computed tomography; CTR, consolidation/tumor ratio; TDR, tumor disappearance ratio.