Table 3. The CT findings of the 176 COP cases.
| Lesions | Unilateral$, N=83 (47%) | Bilateral, N=93 (53%) | Percentage, N (%) | P |
|---|---|---|---|---|
| Lesion type* | ||||
| Nodules | 20 | 50 | 70 (39.8) | <0.01 |
| Consolidation | 57 | 43 | 100 (56.8) | |
| Patchy ground glass | 29 | 83 | 112 (63.6) | |
| Fibrous stripes | 10 | 59 | 69 (39.2) | |
| Mixed pattern | 28 | 87 | 115 (65.3) | |
| Reversed halo sign | 6 | 6 | 12 (6.8) | |
| Distribution 1* | ||||
| Upper/middle/lower | 45/8/32 | 72/60/85 | 117/68/117 | <0.01 |
| Left/right | 35/48 | 93/93 | 128/141 | ns |
| Distribution 2* | ||||
| Underneath the pleura | 36 | 41 | 77 (43.8) | ns |
| Bronchovascular bundle | 28 | 25 | 53 (30.1) | |
| Random | 19 | 27 | 46 (26.1) | |
| Involvement in other tissues | ||||
| Mediastinal lymphadenopathy | 11 | 28 | 39 (22.2) | ns |
| Pleural involvement | 26 | 62 | 88 (50.0) | <0.01 |
| Migratory/possible migratory# | 8/34 | 42/50 | 50/84 (59.5) | <0.01 |
$, unilateral lesions represent that lesions involved only one side of the lung; *, some patients showed multiple types of lesions; therefore, the total number of lesions was higher than the total number of patients; #, patients with migratory lesions presented migratory lesions on chest CT in at least three follow-up examinations. Of the 84 patients with possible migratory lesions, 8 of the 34 patients with ULs had migratory lesions; 42 of the 50 patients with BLs showed migratory lesions. COP, cryptogenic organizing pneumonia; Uls, unilateral lesions; BLs, bilateral lesions.