Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is subtle retrocardiac opacity on the frontal view which is confirmed on the lateral projecting over the heart posteriorly . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is stable . Tortuosity of the descending thoracic aorta is again noted . No acute osseous abnormalities .
    OUTPUT:
    
New focal left lower lobe consolidation which could represent pneumonia in the proper clinical setting .