Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are within normal limits . Nodular opacities at the left lung base are more conspicuous on the current examination . Previously seen opacities involving the right lung base are not well seen on the current examination . There is mild thickening of the horizontal fissure as before . No large pleural effusion or pneumothorax . There may be a trace right pleural effusion .
    OUTPUT:
    
Left lower lobe nodular densities are more conspicuous when compared to the most recent prior study . Right lower lobe densities are less well appreciated on the current examination . No pneumonia .