Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aorta appears tortuous , but the aortic knob appears distinct . Widening of the superior mediastinum is likely due to technique and low inspiratory volumes . No pulmonary edema , focal consolidation , pleural effusion , or large pneumothorax is present . Multiple bilateral displaced rib fractures are noted involving at least ribs 4 through 8 on the left , and rib 4 on the right .
    OUTPUT:
    
Acutely displaced bilateral rib fractures . Low lung volumes result in widening of the superior mediastinum , however if there is concern for injury , a CTA of the chest is recommended for further evaluation .