Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lung volumes are somewhat low however the lungs are clear except for apparent asymmetrical increased opacity in right retrocardiac region compared to the left , difficult to assess on this single projection . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Low lung volumes . Questionable asymmetrical opacification in right retrocardiac region . Consider repeat PA and lateral films for further evaluation if clinically indicated to exclude a pneumonia in this region .