Table 3.
HRCT findings for hypersensitivity patients (n = 154)
| HRCT features | Hypersensitiv-ity pneumonitis (n = 154) |
|---|---|
| HRCT pattern, N (%) | |
| Definite UIP | 10 (7) |
| Possible UIP | 6 (4) |
| Inconsistent with UIP | 138 (90) |
| Extent of fibrosis, N (%) | |
| None | 22 (14) |
| Mild (< 10%) | 43 (28) |
| Moderate (10–50%) | 60 (39) |
| Severe (> 50%) | 29 (19) |
| HRCT reticulation, N (%) | 131 (85) |
| HRCT traction bronchiectasis, N (%) | 123 (80) |
| HRCT honeycombing, N (%) | 53 (34) |
| Inconsistent with UIP features, N (%) | |
| Mid/upper lung predominant fibrosis | 55 (36) |
| Peribronchovascular predominance | 65 (42) |
| Extensive ground glass > reticulations | 88 (57) |
| Centrilobular nodules, no. (%) | 29 (19) |
| Mosaic attenuation in ≥ 3 lobes | 77 (51) |
| Cysts, no. (%) | 13 (8) |
| Consolidation, no. (%) | 16 (10) |
| Probability of HP based on HRCT, N (%)a | |
| Unlikely HP (0/3 features) | 45 (29) |
| Possible HP (1/3 features) | 64 (41) |
| Likely HP (2–3/3 features) | 46 (30) |
a
HP HRCT features include air trapping, mid/upper lung predominance, and centrilobular nodules [20]