Pneumoperitoneum is rare following blunt abdominal injury but can indicate bowel perforation. Soft-tissue windows are used at first, they can detect large amounts of Pneumoperitoneum who appear black (Figure 3.). Smaller collections are attempted on lung windows, followed by bone windows. When detected on CT, it is not specific for bowel injury because air tracking from thoracic injuries can collect in the abdomen. Following penetrating abdominal injury, Pneumoperitoneum detected on CT is likely to indicate bowel perforation and prompts laparotomy in most cases. .
