Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is focal increased opacity in the left retrocardiac area . There is no pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are normal . No acute fractures are identified .
    OUTPUT:
    
Focal increased opacity in the left retrocardiac region which may represent an early pneumonia in the proper clinical setting .