This 3B Scientific® stomach pathology model demonstrates various stages of gastritis from a light gastric ulcer to a perforation. The stomach section with esophagus and duodenum attachment in half life size shows the following pathological changes of the stomach: Erythematous gastritis Erosive gastritis Hemorrhagic gastritis Healing stage with scar formation Atrophic gastritis Hypertrophic gastritis Bleeding ulcer Perforated ulcer An additional relief model of the enlarged stomach wall shows: Healthy mucous membrane Acute gastritis in the antral area Erosive gastritis with mucous membrane defects Bleeding ulcer (eroded muscularis mucosae) Perforated ulcer (all stomach layers eroded) Stomach with ulcers mounted on a base for display in the classroom or doctors office.