Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal lung volumes . There is no focal consolidation , pleural effusion or pneumothorax . Retrocardiac opacities best seen on the lateral view projecting over the spine are slightly more conspicuous since prior . There is no pulmonary edema . Hilar and mediastinal silhouettes are unchanged . Heart size is normal .
    OUTPUT:
    
Left lung base opacities , most likely represents infection in the appropriate clinical setting .