| Surgery-related factors | (n = 84) | % |
| Hemorrhage-related incidents | 45 | 53.6 |
| Preoperative examination | 2 | 2.4 |
| Preoperative treatment | 4 | 4.8 |
| Intraoperative bleeding | 21 | 25.9 |
| Postoperative bleeding | 18 | 21.4 |
| Organ injury-related incidents | 16 | 19 |
| Nerve | 5 | 6.0 |
| Cardiovascular | 4 | 4.8 |
| Lung and trachea | 2 | 2.4 |
| Ureter | 2 | 2.4 |
| Skin | 1 | 1.2 |
| Intestinal tract | 1 | 1.2 |
| Bile duct | 1 | 1.2 |
| Vascular occlusion-related incidents | 7 | 8.3 |