Table 3 Atypical findings in regards to patients’ age
CT findings | (0, 40 yrs], N = 145a | (40, 60 yrs], N = 208a |  > 60 yrs, N = 253a | p-valueb |
|---|---|---|---|---|
Atypical findings | 89 (61%) | 115 (55%) | 151 (60%) | 0.5 |
Isolated upper lobe involvement | 3 (2.1%) | 4 (1.9%) | 3 (1.2%) | 0.8 |
Solitary Involvement | 9 (6.2%) | 5 (2.4%) | 3 (1.2%) | 0.018 |
Peribronchovascular involvement | 11 (7.6%) | 10 (4.8%) | 22 (8.7%) | 0.3 |
Lobar consolidation | 1 (0.7%) | 2 (1.0%) | 0 (0%) | 0.3 |
Tree in bud pattern | 1 (0.7%) | 1 (0.5%) | 1 (0.4%) |  > 0.9 |
Centrilobular nodules | 3 (2.1%) | 3 (1.4%) | 7 (2.8%) | 0.6 |
Pleural effusion | 6 (4.1%) | 4 (1.9%) | 29 (11%) |  < 0.001 |
Pleural thickening | 12 (8.3%) | 26 (12%) | 65 (26%) |  < 0.001 |
Pericardial effusion | 2 (1.4%) | 3 (1.4%) | 13 (5.1%) | 0.040 |
Subpleural sparing | 8 (5.5%) | 14 (6.7%) | 7 (2.8%) | 0.12 |
White lung | 2 (1.4%) | 0 (0%) | 13 (5.1%) |  < 0.001 |
Halo sign | 17 (12%) | 17 (8.2%) | 8 (3.2%) | 0.004 |
Reverse halo sign | 19 (13%) | 29 (14%) | 11 (4.3%) |  < 0.001 |
Double halo sign | 0 (0%) | 1 (0.5%) | 0 (0%) | 0.6 |
Target shaped opacity | 10 (6.9%) | 14 (6.7%) | 4 (1.6%) | 0.011 |
Lymphadenopathy | 3 (2.1%) | 4 (1.9%) | 22 (8.7%) |  < 0.001 |
Cavitation | 0 (0%) | 0 (0%) | 0 (0%) | – |
Air bubble sign | 5 (3.4%) | 6 (2.9%) | 3 (1.2%) | 0.2 |
Airway changes | 10 (6.9%) | 26 (12%) | 66 (26%) |  < 0.001 |