Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are somewhat low . There is no focal consolidation , pleural effusion or pneumothorax . An apparent opacity at the left lung base silhouetting the left heart border is seen only on the frontal view , and may represent prominent pericardial fat . Heart size is normal . No acute osseous abnormalities identified .
    OUTPUT:
    
Low lung volumes , probably clear .