Sporadic gastric epithelial polyps with relative frequency and estimated malignant potential

Polyp type	% of all gastric polyps	Malignant potential
Hyperplastic polyp	17-55%	0.8-10% (>2 cm in size+)
Fundic gland polyp	47-72%	Negligible (but 4% in the setting of FAP)
Adenoma (including PGA)	1-10%	Adenoma with LGD: 0.6%/year Adenoma with HGD: 6%/year PGA: 12-47%
Oxyntic gland adenoma	Rare	Not established

FAP: familial adenomatous polyposis; PGA: pyloric gland adenoma; LGD: low-grade dysplasia; HGD: high-grade dysplasia.

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