Foreign body

A foreign body (FB) is any object originating outside the body of an organism. In machinery, it can mean any unwanted intruding object.A coin seen on AP CXR in the esophagusA coin seen on lateral CXR in the esophagusAP X ray showing a 9mm battery in the intestinesLateral X ray showing a 9mm battery in the intestinesMultiple button batteries in the stomachBottle top swallowed by a dogNeedle swallowed by a cat A foreign body (FB) is any object originating outside the body of an organism. In machinery, it can mean any unwanted intruding object. Most references to foreign bodies involve propulsion through natural orifices into hollow organs. Foreign bodies can be inert or irritating. If they irritate they will cause inflammation and scarring. They can bring infection into the body or acquire infectious agents and protect them from the body's immune defenses. They can obstruct passageways either by their size or by the scarring they cause. Some can be toxic or generate toxic chemicals from reactions with chemicals produced by the body, as is the case with many examples of ingested metal objects. With sufficient force (as in firing of bullets), a foreign body can become lodged into nearly any tissue. One of the most common locations for a foreign body is the alimentary tract.