Appendicitis within an umbilical hernia sac: previously unreported complication in children.

Umbilical hernia is one of the most common congenital pathologies of the anterior abdominal wall in children. Umbilical hernia in children has a high tendency for spontaneous closure. Surgical treatment is performed only for rarely occurring complications. Appendicitis within an umbilical hernia sac is a previously unreported complication for umbilical hernias. We report here the first case in the current English language literature.