Table 2 Incidence of collateral ventilation (23 lungs).
| Collateral ventilation | N |
|---|---|
| All lobes | 5 (22%) |
| Lower–upper | 3 (13%) |
| Middle (lingula)–upper | 2 (9%) |
| Lower–middle (lingula) | 2 (9%) |
| Lower–upper and middle–upper | 3 (13%) |
| None | 8 (34%) |
| Total | 23 |
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