Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low and there are compressive changes in both lower lungs . There is dense retrocardiac opacity that could be due to volume loss / infiltrate / effusion . There is mild pulmonary vascular redistribution . The right subclavian line is unchanged
    OUTPUT:
    
Increased volume loss at the bases . An underlying infectious infiltrate particularly in the left lower lobe can not be excluded .