Findings on MRI
| Findings on MRI | No. of cases | % | Figures |
|---|---|---|---|
| Innominate artery compression | |||
| <20% tracheal compression | 6 | } 38 | 1, 2 |
| 20–50% tracheal compression | 2 | ||
| >50% tracheal compression | 3 | ||
| Complete vascular ring | |||
| Double aortic arch | 3 | } 17 | 3, 4 |
| Right aortic arch | 2 | 5, 6 | |
| Aberrant right subclavian artery | 1 | 3.5 | 7, 8 |
| Aneurysmal left pulmonary artery | 1 | 3.5 | |
| Right bronchogenic cyst | 1 | 3.5 | |
| Intrinsic tracheal stenosis | 1 | 3.5 | |
| Primary tracheomalacia | 1 | 3.5 | |
| No abnormality | 8 | 27.5 |