Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As on prior study , there are increased interstitial markings bilaterally , particularly at the periphery . This is not significantly changed since the CT of ___ . Again there is chronic tenting of the right mediastinum . The heart is slightly enlarged . There is no frank pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Chronic interstitial abnormality is similar to the next most recent chest radiograph . No new focal airspace opacity to suggest pneumonia .