Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is upper limits of normal in size . Lower left heart border and a small portion of the left hemidiaphragm adjacent to this region are obscured , possibly due to a prominent pericardial fat pad . No definite areas of corresponding consolidation are observed on the lateral view . Lungs are otherwise clear , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Subtle opacity at left cardiophrenic angle likely reflects a prominent pericardial fat pad . A focal pneumonia in this region is less likely but followup radiographs may be helpful if warranted clinically , particularly in the absence of older radiographs for comparison .