Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and aortic valve replacement . Heart is mildly enlarged , but stable in size . Partial obscuration of the right heart border is similar in appearance to a chest radiograph from ___ and corresponds to an area of focal atelectasis or scarring in this region on prior PET - CT of ___ . Streaky linear areas of opacity corresponding to areas of bronchial wall thickening and linear atelectasis on prior CT are also similar . No new areas of consolidation are evident within the lungs to suggest an acute pneumonia , and there are no pleural effusions .
    OUTPUT:
    
No evidence of pneumonia .