Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again , lung volumes remain low . There is persistent retrocardiac opacity with silhouetting the left hemidiaphragm consistent with left lower lobe atelectasis or consolidation . There are and likely no air bronchograms seen within the area suggesting this may reflect pneumonia . Right basilar atelectasis . The trachea remains central , the cardiomediastinal contour is unchanged compared to the prior study .
    OUTPUT:
    
Low lung volumes again seen . There is a persistent left lower lobe airspace opacity , the appearance remain suspicious for infection although atelectasis remains in differential diagnosis .