Appendix perforation is one of the many causes of secondary peritonitis. In this report, a case of peritonitis caused by Shigella sonnei in a 7-year-old child was presented. A 7-year-old male patient was presented with tenderness in the right lower quadrant and positive rebound tenderness test on physical examination. Abdominal ultrasonography and computed tomography revealed appendicular colitis and intraabdominal free fluid. The patient underwent surgery, during which perforation of appendix was noted. During the post-operative period, peritonitis developed. S. sonnei was isolated from peritoneal fluid secondary to perforation of appendix. Association of S. sonnei and appendicitis along with secondary peritonitis should be kept in mind when treating patients with abdominal pain and gastroenteritis.
Key words: Appendicitis, peritonitis, Shigella sonnei.
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