Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a retrocardiac opacity which may reflect a developing consolidation . The cardiomediastinal silhouette , hilar contours are stable . There is no pleural effusion or pneumothorax . The thoracic aorta is tortuous .
    OUTPUT:
    
Retrocardiac opacity which may reflect pneumonia in the appropriate clinical setting . .