ABSTRACT
Recurrent aphthous stomatitis involves recurrent oral ulcers seen in the absence of systemic disease. The importance of trefoil peptides is emphasized by their close association with regeneration and repair of ulcers at a number of sites in the gastrointestinal tract. Lymphomas in the gastrointestinal tract are most frequently seen in the stomach, with most of the remaining cases arising in the intestines. The stomach is a roughly J-shaped dilatation of the gut, functioning as a reservoir of ingested food and controlling the release of manageable quantities into the duodenum, which has a much smaller capacity. Congenital defects of the stomach are uncommon. Cysts and duplications may occur. In diaphragmatic hernia there is a failure of development of part of one dome of the diaphragm, with herniation of all or part of the stomach, usually together with intestine, into the thoracic cavity.
