Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including mild to moderate cardiomegaly . There is a persistent small to moderate pleural effusion on the left . What has changed is increased patchy opacity in the left mid and lower lungs . There is background mild interstitial abnormality suggesting some degree of coinciding fluid overload .
    OUTPUT:
    
Increasing opacification of the left lower lobe concerning for pneumonia versus waxing and waning , now increased atelectasis . Suspected mild coinciding fluid overload .