Adenocarcinoma of the small intestine is a form of cancer that occurs in the part of the intestine that descends from the stomach. It is a rare form of cancer.
The small intestine plays a key role in the digestion of foods. Many nutrients are absorbed by the small intestine as food passes through it. Adenocarcinoma occurs in the tissues that line the small intestine. It causes the cells in these tissues to grow and multiply out of control. These cells form a tumor along the wall of the intestine. This tumor then begins to invade the tissues around it.
In time, the tumor will grow through the intestinal wall. The tumor then goes on to invade structures around the intestine. Cancer cells can break off from the tumor and metastasize. This means the cancer is spread through the bloodstream. Cancer cells can also spread through the system that drains into lymph nodes.
The risk factors for this type of cancer are not well defined. Diet may play a role, especially a diet high in nitrates. Some other risk factors may include: