Figure 18. Active hemorrhage in a 9-year-old boy who was ejected from an automobile during a motor vehicle accident. CT scan shows evidence of active bleeding into the mesentery (arrowheads), thickening of the bowel wall (arrow), fluid at the mesenteric root (M), and free fluid (F). At surgery, a large ileal mesenteric tear was found with ischemia of the ileum and mesoappendix but no perforation.