Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased left retrocardiac opacity as well as a nonspecific opacity in the left mid lung . There right basal atelectasis . The heart size is mildly enlarged , unchanged from prior . The mediastinal and hilar contours are unchanged in not enlarged . Note is made of a persistent small left pleural effusion . There is no pneumothorax . Right central catheter tip terminates in the right atrium . Single chamber cardiac pacer projects over the heart .
    OUTPUT:
    
Left mid and lower lung opacity , which may represent early / developing pneumonia . Consider standard PA and lateral chest radiographs for more complete assessment of these findings when the patient 's condition permits .