Table 2.
CT findings
| All (n=45) | GPA (n=26) | RP (n=19) | Odds ratio for GPA | P value | |
|---|---|---|---|---|---|
| Airway segment involved | |||||
| Subglottic tracheaa | 21/38 (55%) | 18/23 (78%) | 3/15 (20%) | 14.40 [3.22; 85.07] | 0.001 |
| Cervical trachea | 27/45 (60%) | 16/26 (62%) | 11/19 (58%) | 1.16 [0.34; 3.92] | 0.838 |
| Thoracic trachea | 17/45 (38%) | 5/26 (19%) | 12/19 (63%) | 0.14 [0.03; 0.51] | 0.009 |
| Main bronchi | 21/45 (47%) | 10/26 (38%) | 11/19 (58%) | 0.45 [0.13; 1.50] | 0.278 |
| Lobar bronchi | 20/45 (44%) | 10/26 (38%) | 10/19 (53%) | 0.56 [0.17; 1.85] | 0.430 |
| Distal bronchi | 23/45 (51%) | 12/26 (46%) | 11/19 (58%) | 0.62 [0.18; 2.04] | 0.515 |
| Extensive involvement | 15/45 (33%) | 4/26 (15%) | 11/19 (58%) | 0.13 [0.03; 0.50] | 0.009 |
| Airwall thickening | |||||
| Trachea | 33/45 (73%) | 20/26 (77%) | 13/19 (68%) | 1.54 [0.40; 5.96] | 0.597 |
| Bronchi | 23/45 (51%) | 11/26 (42%) | 12/19 (63%) | 0.43 [0.12; 1.41] | 0.244 |
| Sparing the posterior tracheal membrane | 14/45 (31%) | 3/26 (12%) | 11/19 (58%) | 0.09 [0.02; 0.39] | 0.003 |
| Irregular | 8/45 (18%) | 7/26 (27%) | 1/19 (5%) | 6.63 [1.03; 130.49] | 0.090 |
| Airway stenosis | |||||
| Trachea | 14/45 (31%) | 8/26 (31%) | 6/19 (32%) | 0.96 [0.27; 3.56] | 0.962 |
| Main/lobar bronchi | 17/45 (38%) | 7/26 (27%) | 10/19 (53%) | 0.33 [0.09; 1.13] | 0.138 |
| Distal bronchi | 15/45 (33%) | 9/26 (35%) | 6/19 (32%) | 1.15 [0.33; 4.20] | 0.859 |
| Tracheal calcifications | 15/45 (33%) | 5/26 (19%) | 10/19 (53%) | 0.21 [0.05; 0.78] | 0.045 |
| Tracheobronchomalacia | 10/20 (50%) | 1/5 (20%) | 9/15 (60%) | 0.17 [0.01; 1.47] | 0.148 |
| Bronchiectasis | 14/45 (31%) | 9/26 (35%) | 5/19 (26%) | 1.48 [0.41; 5.78] | 0.619 |
| Mosaic perfusion | 35/45 (78%) | 18/26 (69%) | 17/19 (89%) | 0.26 [0.04; 1.24] | 0.159 |
| Air trapping | 15/20 (75%) | 3/5 (60%) | 12/15 (80%) | 0.38 [0.04; 3.80] | 0.441 |
| Pulmonary nodule | 7/45 (16%) | 6/26 (23%) | 1/19 (5%) | 5.40 [0.81; 107.21] | 0.146 |
| Pulmonary consolidation | 5/45 (11%) | 4/26 (15%) | 1/19 (5%) | 3.27 [0.44; 67.10] | 0.352 |
Qualitative data are presented as proportion with percentage in parentheses, and quantitative data are presented as median with interquartile range in brackets
GPA granulomatosis with polyangiitis, RP relapsing polychondritis
aThe subglottic trachea was out of the scanning field in 7 patients