| Variables | Number | Percentage |
| Type of endoscopy | ||
| Rectosigmoidoscopy | 40 | 58.8 |
| Total colonoscopy | 28 | 41.2 |
| Tumor site | ||
| Lower rectum | 31 | 45.6 |
| Middle rectum | 21 | 30.9 |
| High rectum | 16 | 23.5 |
| Location of the tumor | ||
| Circumferential | 26 | 38.2 |
| Anterior | 23 | 33.8 |
| Posterior | 5 | 7.3 |
| Left side | 8 | 11.8 |
| Right side | 6 | 8.8 |
| Macroscopic aspect | ||
| Budding appearance | 29 | 42.2 |
| Ulcerative budding appearance | 31 | 45.6 |
| Ulcerative infiltration | 7 | 10.3 |
| Stenosing aspect | 23 | 33.8 |
| Hemorrhagic lesion | 14 | 20.6 |