Differential for acquired causes of intestinal obstruction in children (older) is described in Practical Pediatric Imaging: Diagnostic Radiolog

Differential for acquired causes of intestinal obstruction in children (older) is described in Practical Pediatric Imaging: Diagnostic Radiology of Infants and Children as follows: (Take AAIIMM) Adhesions (from surgery) Appendicitis (often with abscess formation) Incarcerated inguinal hernia Intussusception Malrotation with volvulus Miscellaneous causes Meckel's diverticulum Duplication Ingested foreign body Causes of pneumoperitoneum in older infants and children include the following: Bowel perforation (Meckel's, appendix, ulcer, trauma) Perforation of other organ (uterus, vagina, bladder) Iatrogenic causes (dissection from pneumomediastinum, surgery, paracentesis, biopsy, resuscitation) CT evidence of appendicitis includes the following: Enlargement of the appendix Wall enhancement Periappendiceal fat stranding Appendicolith Wall thickening of the cecum or terminal ileum Check for associated abscess. References: Donnelly, LF. Fundamentals of Pediatric Radiology. First Edition. 2001. W.B. Saunders Company. Incesu, L, Taylor, CR, et al: Appendicitis. Emedicine. June 2004. Accessed May 12, 2007. Kirks, DR; Griscom, NT. Practical Pediatric Imaging: Diagnostic Radiology of Infants and Children. Third Edition. 1998. Lippincott-Raven Publishers.