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*Very rare.
*APC promotor IB mutations.<ref name=pmid30584346/>
Features - all required:<ref name=pmid30584346/>
*Polyps of stomach in body and fundus only.
**>100 polyps in index case ''or'' >30 polyps in first degree relative.
**Histology predominantly [[fundic gland polyp]]s - some with dysplasia or adenocarcinoma.
*No colorectal or duodenal polyposis.
*Autosomal dominant inheritance.
*Exclusion of other heritable polyposis syndrome involving the stomach, PPI use.
==See also==


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