<prompt> Which of the following is not a commoner cause of intestinal perforation: March 2007Gastric ulcerGastrointestinal cancerTyphoidCrohns disease  <response>: Ans. D: Crohns diseasePerforation of the intestines results in the potential for bacterial contamination of the abdominal cavity a condition known as peritonitis.Perforation of the stomach can lead to a chemical peritonitis due to leaked gastric acid.CausesUnderlying causes include:Gastric ulcerAppendicitisGastrointestinal cancerDiveiculitisSuperior Mesenteric Aery SyndromeTraumaAscariasisTyphoidOn X-rays, free gas may be visible in the abdominal cavity. The perforation can often be visualised using CT. White blood cells are often elevated. 