Figure 19. Mesenteric pseudoaneurysm in an 8-year-old boy who was hemodynamically stable after a head-on motor vehicle accident in which he was restrained. CT scan shows a large hematoma (H) in the midabdomen on the right side with an enhancing pseudoaneurysm (*) and evidence of active hemorrhage (arrowheads). F = free intraperitoneal fluid. At surgery, a large mesenteric tear with right colonic ischemia was found.