Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is slightly limited by technique . Within this limitation , the inspiratory lung volumes remain low . The coarse reticular markings in the lung parenchyma are increased from the prior study , more pronounced in the lung bases . In particular , there is decreased aeration of the right lung base , which may represent atelectasis or developing airspace disease . The pulmonary vasculature is unchanged . No pneumothorax is detected . The cardiac silhouette is enlarged but stable . The mediastinal and hilar contours are within normal limits . Partial calcification of the aortic knob is re-demonstrated . No acute osseous abnormality is detected .
    OUTPUT:
    
1 . Increased opacification of the right lung base may reflect atelectasis or developing airspace disease . Recommend clinical correlation . 2 . Increased interstitial opacities suggest chronic background fibrotic changes of the lungs with superimposed pulmonary edema . 3 . Stable cardiomegaly .