Plain x-ray plays a limited role in the evaluation of blunt abdominal trauma. Abdominal radiographs are usually unnecessary. X-rays of the chest and pelvis are often obtained to evaluate for concurrent thoracic or pelvic injuries. Abnormal chest x-ray findings of pneumothorax and rib fractures are associated with intraabdominal injuries and are indications for abdominal imaging if a mechanism for multisystem trauma is present. Common findings include free abdominal air (pneumoperitoneum), pneumothorax, and hemothorax. In the case of gunshot wounds, x-rays identify the location and number of retained projectiles. .
