An adenocarcinoma arising from the stomach. Microscopically, it is characterized by the presence of a diffuse infiltrate, composed of individual adenocarcinoma cells or groups of adenocarcinoma cells in a fibrous or mucoid stroma. Many cells contain mucin droplets, producing a signet-ring configuration. The disease is diffuse gastric adenocarcinoma (MONDO_0005017). Also known as: adenocarcinoma of linitis plastica type, adenocarcinoma of the linitis plastica type, carcinoma, diffuse type, carcinoma, diffuse type (morphologic abnormality), diffuse adenocarcinoma of stomach, diffuse adenocarcinoma of the stomach, diffuse stomach adenocarcinoma, gastric diffuse adenocarcinoma.