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Enteral Metal Stenting

A self-expandable metallic stent (or SEMS ) is a metallic tube, or stent that holds open a structure in the gastrointestional tact to allow the passage of food, chyme,tool, or other secretions related to digestion,Surgeons insert SEMS by endoscopy, inserting a fibre optic camera—either through the mouth or colon,—to reach an area of narrowing. As such, it is termed an endoprosthesis. SEMS can also be inserted using fluoroscopy, where the surgeon uses an X-ray image to guide insertion, or as an adjunct to endoscopy.

The vast majority of SEMS are used to alleviate symptoms caused by cancers of the gastrointestinal tract that obstruct the interior of the tube-like (or luminal) structures of the bowel — namely the esophagus, common bile duct and colon. SEMS are designed to be permanent and, as a result, are often used when the cancer is at an advanced stage and cannot be removed by surgery.