Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . The lung volumes are slightly low . There is a new left basilar retrocardiac opacity . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe focal consolidation worrisome for infection in the proper clinical setting . Recommend follow up imaging after treatment to ensure resolution .