Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , resulting in bronchovascular crowding . Atelectatic changes at the bilateral bases are presumed to be secondary to hypoventilation in the setting of splinting . Cardiomediastinal and hilar contours are unchanged . No pleural effusion or consolidation . Partially imaged spinal fusion hardware appears intact . Comminuted sternal fracture , multiple bilateral rib fractures , and trace bilateral basilar pneumothoraces are better assessed on CT of the chest performed concurrently .
    OUTPUT:
    
Comminuted sternal fracture , multiple bilateral rib fractures , and trace bilateral basilar pneumothoraces are better assessed on CT of the chest performed concurrently .