Torsion of vermiform appendix: value of ultrasonographic findings

A case of torsion of the vermiform appendix is described in a five-year-old boy with a two-day history of right-sided abdominal pain. No associated abdominal tenderness was reported, no vomiting nor fever. The pain was localized in the same place for 24 hours and became more severe and constant. Blood film showed a normal white cell count. After two ultrasonographic examinations in the course of 24 hours, the sign of a distended intestinal loop became constant. With the diagnosis of mucous-producing appendicular lesions or appendicular torsion, a laparotomy was performed. The appendix was severely congested and gangrenous; there was a 360-degree anticlockwise twist in its base. The related literature is reviewed and the value of the ultrasound scanner images and the possible mechanism involved is discussed.