Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is a persistent left basilar retrocardiac opacity with air bronchograms and a moderate left - sided pleural effusion . There is also a suspected small right - sided pleural effusion , although not definitive . Elsewhere , the lungs appear clear . A left subclavian central venous catheter terminates in the superior vena cava . A pigtail drainage catheter projects over the left lower quadrant . There is also a balloon associated with gastrojejunostomy tube projecting over the left mid abdomen .
    OUTPUT:
    
Persistent left basilar opacity with pleural effusion . Differential considerations include pneumonia , although atelectasis associated with pleural effusion could explain the appearance .