Computed tomography distribution of bronchiectasis
| UL | ML | LL | Widespread | Unilateral | Bilateral | Bilateral symmetrical | |
| Immunodeficiency | 20 | 37 | 42 | 9 | 8 | 38 | 28 |
| Idiopathic | 6 | 25 | 28 | 3 | 15 | 20 | 15 |
| Aspiration | 9 | 13 | 20 | 6 | 10 | 15 | 14 |
| PCD | 5 | 17 | 18 | 0 | 5 | 15 | 15 |
| Congenital malformations | 3 | 2 | 3 | 0 | 4 | 1 | 1 |
| Childhood infection | 4 | 4 | 4 | 1 | 2 | 3 | 2 |
Data are presented as n. UL: upper lobe involvement; ML: middle lobe involvement; LL: lower lobe involvement; widespread: involvement of ≥5 lobes; unilateral: involvement of only one side; bilateral: involvement of both sides; bilateral symmetrical: involvement of identical lobes on both sides; PCD: primary ciliary dyskinesia.