Chart 1. Predisposing conditions to small bowel cancer.
| Risk factors | Tumor type | |
|---|---|---|
| Small bowel adenoma(14,15) | Adenocarcinoma | Risk is more important for increased size, higher dysplasia grade and villous morphology |
| Crohn’s disease(16) | Adenocarcinoma | A relative risk of 33 |
| Coeliac disease(17,18) | Adenocarcinoma and lymphoma | A relative risk for adenocarcinoma of 60-80 |
| Hereditary non-polyposis colorectal cancer(19) | Adenocarcinoma | A relative risk more than 100 |
| Familial adenomatous polyposis(20) | Adenocarcinoma | 3-5% will develop duodenal cancer |
| Peutz Jeghers syndrome(21) | Adenocarcinoma | A relative risk of 520 |