Forty-two cases with a Meckel's diverticulum causing acute abdominal symptoms were examined radiologically and are reported. X-ray examination of the abdomen may help to establish the diagnosis by showing peritoneal irritation, pneumoperitoneum, calcification in the diverticulum or oedematous ileal loops. Inflammation in the Meckel's diverticulum, contrary to appendicitis, seems very rarely to produce gas and a fluid level in the caecum. In small children, with a low obstruction, Meckel's diverticulum is in all probability the cause, if intussusception and appendicitis can be excluded by barium enema.
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