Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains moderately enlarged . The mediastinal and hilar contours are within normal limits . Pulmonary vasculature is not engorged . Patchy opacities within the lung bases likely reflect areas of atelectasis . Blunting of the right costophrenic angle likely reflects chronic pleural thickening , as seen previously . No focal consolidation or pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Patchy atelectasis in the lung bases . Blunting of the right costophrenic angle likely reflects chronic pleural thickening , without evidence for a pleural effusion .