Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . There is mild unfolding along the thoracic aorta . There is a mild interstitial abnormality suggesting vascular congestion . The lung volumes are low , but hemidiaphragmatic flattening is suggestive of background hyperinflation of the lungs . The lateral view shows a focal posterior opacity in the left lower lobe , concerning for pneumonia . Bony structures are unremarkable .
    OUTPUT:
    
Findings suggesting slight fluid overload . Focal left lower lobe opacity is worrisome for pneumonia .