Table 5. Extracolonic Tumor Risks in Familial Adenomatous Polyposis
| Malignancy | Relative Risk | Absolute Lifetime Risk (%) |
| Desmoid | 852.0 | 15.0 |
| Duodenum | 330.8 | 5.0–12.0 |
| Thyroid | 7.6 | 2.0 |
| Brain | 7.0 | 2.0 |
| Ampullary | 123.7 | 1.7 |
| Pancreas | 4.5 | 1.7 |
| Hepatoblastoma | 847.0 | 1.6 |
| Gastric | — | 0.6a |
| Adapted from Giardiello et al.,[12] Jagelman et al.,[13] Sturt et al.,[14] Lynch et al.,[15] Bülow et al.,[16] Burt et al.,[17] and Galiatsatos et al.[18] | ||
| aThe Leeds Castle Polyposis Group. |
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