Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe opacity obscuring the left heart border is seen only on frontal projection and is likely from the epicardial fat pad ___ is a ___ effect from ribs . No additional focal opacity , pneumothorax , pulmonary edema ___ pleural effusion . Heart size , mediastinal and hilar contours are normal . No bony abnormality .
    OUTPUT:
    
Left lower lobe opacity is likely epicardial fat pad ___ ___ effect from ribs , and is less likely to be pneumonia .