hyperplastic gastric polyp

"regeneration polyp", "inflammatory polyp"

most common type of gastric polyp (75-90%)
histology: proliferated gastric mucosa with acute and chronic inflammatory infiltrates in lamina propria
location: randomly distributed in stomach
associated with
- chronic atrophic gastritis
- pernicious anemia
findings:
1. sharply delineated polyp with smooth circular border
2. "Mexican hat sign": stalk seen en face overlying the head of the polyp
3. sessile/pedunculate; usually multiple
4. usually < 1 cm
5. no contour defect in stomach

Yong H. Hahn, MD - 2 February 1995
Last updated: 1 October 2013