| Topography of lesions | Numbers | % |
| Stenosis of the mouth of Killian | 27 | 40.3 |
| 1/3 middle esophagus | 7 | 10.4 |
| 1/3 middle and lower esophagus | 2 | 3 |
| Killian’s mouth stenosis + middle 1/3 esophagus | 5 | 7.5 |
| Stenosis of Killian’s mouth and lower 1/3 of the esophagus | 3 | 4.5 |
| 1/3 lower esophagus | 23 | 34.3 |
| Total | 67 | 100 |