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Foreign Bodies in the Small Intestine of Cats
Drs. Foster & Smith, Inc.
Race Foster, DVM
Digestive System
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Graphic of linear string

Cats may eat objects other than food. Balls, pieces of corn cobs, coins, strings, etc., are all examples of foreign bodies. Many objects are too large to leave the stomach. Smaller objects, however, such as paper clips and strings can pass through the stomach, but may cause a blockage of the small intestine.

Sometimes a cat who eats a string will get a loop of the string under its tongue, so both ends of the string go down the esophagus into the stomach and intestine. In this situation the string can not pass through the digestive system, since it is looped under the tongue. As a result, the cat starts vomiting. Veterinarians often call this entrapped string a 'linear string foreign body.'

What are the symptoms?

Vomiting and a poor appetite are generally the initial signs of a foreign body in the small intestine. The cat will usually have a tense abdomen with few or no bowel movements. Commonly the temperature is elevated, especially if the intestine has been punctured.

What are the risks?

Intestine 'accordioning' up on a string

Linear string foreign body; the intestine 'accordions' up on the string.

Strings (yarn, fishing line, etc.) present the greatest danger. Because of their length, they involve a longer section of the bowel. Movement of the small intestine causes 'bunching up' on the string much like an accordion. With continued waves of movement across this area, the string becomes tighter and cuts through the wall of the intestine, often in several places. This results in peritonitis (inflammation of the thin lining of the abdominal cavity) when the intestinal contents leak into the abdomen. Linear foreign bodies can also cause an intussusception. Most larger intestinal foreign bodies simply get stuck in the intestine, where they cause a blockage that prevents food from moving through the tract. All suspected incidences of an intestinal foreign body are emergencies and should be monitored closely.

What is the management?

If you see a string or thread under your cat's tongue, do not pull on it, but contact your veterinarian immediately. Pulling on the string could cause severe damage to the intestines or esophagus.

Radiographs, occasionally with barium, are used to confirm the diagnosis of intestinal foreign bodies. Surgery is generally required to remove the object or material. Often, the damaged section of the intestine must be removed and the unaffected ends reattached. In some cases, lubricating agents such as petroleum jelly can be used to help the foreign body slide on into the colon, which is larger than the small intestine. From there, objects can pass on. Most cats fully recover once surgical correction is accomplished, if the foreign body has not penetrated through the intestine. If penetration has occurred, the prognosis is much more guarded.

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