Stomach "mouth". The words "gastro-" and "gastric" (meaning related to the stomach) are both derived from the Greek word "gaster" (, meaning "belly"). Although the precise shape and size of the stomach varies widely among different vertebrates, the relative positions of the oesophageal and duodenal openings remain relatively constant. As a result, the organ always curves somewhat to the left before curving back to meet the pyloric sphincter. However, lampreys, hagfishes, chimaeras, lungfishes, and some teleost fish have no stomach at all, with the oesophagus opening directly into the anus. These animals all consume diets that either require little storage of
Tumor of the stomach Diet high in salt and nitrates. 4. Polyps 5. Genetic alterations - p53 mutation, microsatellite instability, E-cadherin gene 6. Previous radiation 7. Pernicious anaemia Signs and Symptoms Dysphagia, indigestion, feeling full after eating very little, loss of appetite, nausea, abdominal pain, loss of weight, vomitting blood and passing black stool. Investigations Upper Gastointestinal Endoscopy. Tumor of the stomach A gastric tumor is a tumor of the stomach. It can be benign or malignant (gastric cancer). The gastric mucosa is composed of columnar epithelium arranged with pits known as crypts. There are several types of cells that make up gastric mucosa