Figures 10-12. (10) Bowel wall thickening in a 4-year-old boy who was ejected from an automobile during a high-speed motor vehicle accident. CT scan shows focal small bowel thickening on the left side (arrows). Note the fluid at the mesenteric root (M). There is a moderate amount of free fluid (F); the free fluid was predominantly located within the pelvis. A small jejunal perforation was found at surgery. (11) Bowel wall thickening in a 6-year-old boy who suffered a direct blow to the right lower quadrant during a motor vehicle accident. CT scan shows a thickened bowel wall in the right lower quadrant (arrows) with underlying mesenteric stranding (M). Note the small hematoma around the mesenteric vessels (arrowheads). F = free intraperitoneal fluid. At laparoscopy, a small area of jejunal infarction and perforation that corresponded to the CT abnormality was seen. This area was repaired laparoscopically. (12) Bowel wall thickening in a 17-year-old girl with complex pelvic fractures from a motor vehicle accident. An extraperitoneal bladder rupture was demonstrated with cystography. Owing to the contrast material load from angiography and pelvic embolization, the subsequent abdominal CT study was performed without additional intravenous contrast material. CT scan shows free intraperitoneal air (arrowheads). Despite the absence of contrast material, bowel wall thickening is seen on the right side (arrows). Note the difference in comparison with the imperceptible bowel wall on the left side. An ileal perforation was found at surgery.