By catarrhal appendicitis is meant the initial stage of changes in the mucous layer of the appendix. In this case, inflammation has a mostly superficial character, which means that it does not affect the deep tissues, but develops in the cells of the epithelium.
Acute surgical pathology of the peritoneum, which consists in twisting any part of the intestine or its part around the mesentery or its axis. The gut lumen is overlapped, the mesenteric nerves and blood vessels are squashed, a mechanical obstacle arises in the digestive tract.
When the internal infectious inflammation of the tissues, accompanied by their destruction and purulent fusion, is classified as a subdiaphragmatic abscess, this means that the abscess (limited by a pus accumulation capsule) is located in the sub-abdominal area of the abdominal cavity