Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph demonstrates low lung volumes . Allowing for differences in patient positioning , the cardiomediastinal and hilar contours are stable in appearance . There is mild pulmonary vascular congestion . Blunting of right costophrenic angle posteriorly which may reflect small pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular congestion and enlarged heart size . No focal opacity convincing for pneumonia .