Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacity at the left lung base , with associated volume loss . This could represent worsening of effusion and atelectasis , though developing pneumonia can not be excluded . Additional increasec opacity in the right suprahilar region may reflect additional focus of airspace disease . Elsewhere , the lungs remain well aerated . A small amount of right pleural fluid is present . Heart size is persistenly enalrged . There is pulmonary vascular engorgement without frank edema , which is little changed from prior study .
    OUTPUT:
    
Increased left basilar and right upper lung opacity could reflect developing pneumonia in the proper clinical setting .