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! Subtype | ! Subtype | ||
! Prevalence | ! Prevalence | ||
! | ! Origin/definition | ||
! Subclassification | ! Subclassification | ||
|- | |- | ||
| Intra-ampullary carcinoma | | Intra-ampullary carcinoma | ||
| ~25% of cases | | ~25% of cases | ||
| intra-ampullary epithelium and/or distal end of CBD or pancreatic duct | | arises from intra-ampullary epithelium and/or distal end of CBD or pancreatic duct | ||
| | | | ||
|- | |- | ||
| Ampullary-ductal carcinoma | | Ampullary-ductal carcinoma | ||
| ~15% of cases | | ~15% of cases | ||
| | | arises from intra-ampullary ducts | ||
| | | | ||
|- | |- | ||
| Peri-ampullary duodenal carcinoma | | Peri-ampullary duodenal carcinoma | ||
| ~5% of cases | | ~5% of cases | ||
| | | primarily in the duodenal, ampullary orfice must be clearly within lesion | ||
| (1) intestinal type, (2) mixed mucinous-intestinal type | | (1) intestinal type, (2) mixed mucinous-intestinal type | ||
|- | |- |
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