Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pneumomediastinum is best appreciated on the lateral view . There is no evidence of pneumothorax . Severe subcutaneous emphysema is unchanged since earlier in the day . Mild cardiomegaly is unchanged . There is mild pulmonary vascular congestion but previous moderate edema has improved . There may be a small right pleural effusion . A right pigtail catheter projects over the right lateral chest . Again seen are displaced right rib fractures .
    OUTPUT:
    
Pneumomediastinum without evidence of pneumothorax . Severe subcutaneous emphysema with right pigtail catheter projecting over the right lateral chest . Mild pulmonary has improved , but pulmonary vascular congestion and mild cardiomegaly persist . Known displaced right lateral rib fractures .