Table 3.
Comparison of CT findings between primary influenza pneumonia cases and concomitant/secondary bacterial pneumonia cases
| Primary influenza pneumonia (n = 30) | Concomitant/secondary bacterial pneumonia (n = 13) | P‐value | |
|---|---|---|---|
| Patterns of radiographic abnormality | |||
| Consolidation | 0 (0) | 1 (7·7) | 0.08 |
| GGO | 15 (50·0) | 2 (15·4) | |
| Consolidation + GGO | 15 (50·0) | 10 (76·9) | |
| Nodular lesion | 6 (20·0) | 6 (46·2) | 0.08 |
| Extent of lung involvement | |||
| Unifocal (1–2 lesions) | 8 (26·7) | 2 (15·4) | 0.61 |
| Multifocal (3–5 lesions) | 16 (53·3) | 9 (69·2) | |
| Diffuse (≥6 lesions) | 6 (20·0) | 2 (15·4) | |
| Predominance | |||
| Central zone (upper and middle lobe) | 6 (20·0) | 1 (7·7) | 0.6 |
| Peripheral zone (lower lobe) | 12 (40·0) | 6 (46·2) | |
| Both | 12 (40·0) | 6 (46·2) | |
| Pleural effusion | 0 (0) | 4 (30·8) | 0.01 |
| Lymph node enlargement | 3 (10·0) | 4 (30·8) | 0.09 |
| Pneumomediastinum | 3 (10·0) | 0 (0) | 0.24 |
GGO, ground‐glass opacity.