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A foreign body or sometimes known as FB (Latin: ''corpus alienum'') is any object originating outside the body. 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. With sufficient force (as in firing of bullets), a foreign body can become lodged into nearly any tissue. ==Alimentary tract== (詳細はalimentary tract. It is possible for foreign bodies to enter the tract from the mouth, or from the rectum. Both children and adults experience problems caused by foreign objects getting stuck in their bodies. Young children, in particular, are naturally curious and may intentionally put shiny objects, such as coins or button batteries, into their mouths. They also like to stick things in their ears and up their noses.〔(【引用サイトリンク】title=Foreign Bodies: Nose and Paranasal Sinus Disorders: Merck Manual Professional )〕 The effect of a foreign body can be very different. For example, a coin causes local pressure on the tissue but generally, is not a medical emergency to remove. A button battery, which can be a very similar size to a coin, generates hydroxide ions at the anode and causes a chemical burn in 2 hours. An ingested button battery that is stuck in the esophagus is a medical emergency. In 2009, Avolio Luigi and Martucciello Giuseppe showed that although ingested nonmagnetic foreign bodies are likely to be passed spontaneously without consequence, ingested magnets (magnetic toys) may attract each other through children's intestinal walls and cause severe damage, such as pressure necrosis, perforation, intestinal fistulas, volvulus, and obstruction.〔Avolio L, Martucciello G.(2009 Jun)."Images in clinical medicine. Ingested magnets".N Engl J Med. 25;360(26):2770〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「foreign body」の詳細全文を読む スポンサード リンク
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