Peritonitis fibrosis is an inflammation of the peritoneum, characterized by the formation of parietal serous effusion caused by the formation of connective tissue and the formation of adhesions. In some cases, the cause of peritonitis fibrosis may be the impregnation of the peritoneal layers with fibrin and the organization of an inflammatory infiltrate. The patient has a diffuse infiltrate at the site of inflammation, which does not have clear boundaries or movements.