Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal , and hilar contours are normal . There are bibasal lower lung patchy opacities which may represent atelectasis or aspiration . Mild vascular congestion is present as well . No obvious bony deformity , although chest radiograph is not optimal for evaluation after chest trauma .
    OUTPUT:
    
1 . Bibasal lower lung patchy opacities which may represent atelectasis or aspiration . Mild vascular congestion is present as well . 2 . Chest radiograph is not optimal for evaluation after chest trauma . However , no obvious bony deformity .