Ess goes into the rectum as stool (feces), where it is stored until it passes out of the body through the anus. Gastrointestinal stromal tumors gastrointestinal stromal tumors (gists) are fairly rare tumors of the gi tract. These tumors start in special cells found in the wall of the gi tract, called the interstitial cells of cajal (iccs), or in very early cells that can develop into iccs. Iccs are part of the autonomic nervous system, the part of the nervous system that regulates body processes such as digesting food. viagra canada Iccs are sometimes called the "pacemakers" of the gi tract because they send signals to the muscles in the digestive system, telling them to contract to move food and liquid through the gi tract. viagra generic Not all gists are cancerous. Some are benign (not cancerous) – they don't grow into other areas or spread to other parts of the body. good side effects of viagra There are ways to find out whether a gist is benign or cancerous. viagra ice cream go sale selfridges These are discussed further in the section, " how are gastrointestinal stromal tumors diagnosed? " more than half of gists start in the stomach. Most of the others start in the small intestine, but gists can start anywhere along the gi tract. good side effects of viagra Other gastrointestinal tract cancers cancers can occur anywhere in the gi tract – from the esophagus to the anus. how to buy cheap viagra online Usually, these cancers start in glandular cells that line most of the gi tract. The cancers that develop in these cells are called adenocarcinomas. Most cancers of the gi tract, including those of the esophagus, stomach, colon, and rectum, are adenocarcinomas. Some parts of the gi tract, like the upper part of the esophagus and the end of the anus, are lined with flat cells called squamous cells. These are the same type of cells that are found on the surface of the skin. Cancers starting in these cells are called squamous cell carcinomas. The gi tract also has neuroendocrine cells. These cells have some features in common with nerve cells but other features in common with hormone-producing (endocrine) cells. buy viagra Neuroendocrine cancers can develop from these cells. is generic viagra safe This type of cancer is rare in the gi tract. Carcinoid tumors are an example of a neuroendocrine cancer found in the gi tract. Other rare types of cancer that can be seen in the gi tract include leiomyosarcomas, angiosarcomas, and peripheral nerve sheath tumors. These arise from muscle cells, blood vessel cells, and nerve cells in the gi tract. 36 hour viagra vs viagra Gists are different from these other gi tract cancers. First, they start in different types of cells. good side effects of viagra Gists are also quite different in their treatment and prognosis (outlook). This is why doctors need to figure out whether a person with a tumor in the gi tract has a gi. viagra cost