Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Low lung volumes . Old left rib fractures are seen . There is increased opacity in the retro cardiac area . It is only seen on the frontal view and may represent crowding of vessels due to poor inspiratory effort ; however , can not rule out pneumonia given patient 's clinical symptoms . No pleural effusion or pneumothorax . Cardiac , mediastinal and hilar contours are normal .
    OUTPUT:
    
Retrocardiac opacity may represent crowded vessels given the patient poor inspiratory effort , however , can not rule out pneumonia given patient 's clinical symptoms . These findings were discussed with the team at 4 : 15 p .m . on ___ by telephone .