Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The patient is status post coronary artery bypass graft surgery . There is mild unfolding and calcification along the aorta . Hilar contours are unchanged . Within the background of slightly generalized worsening of lung markings there is a focal interstitial opacification at the right lung base , probably in the right lower lobe . The appearance is highly nonspecific . In the absence of pulmonary symptoms , atelectasis or scarring could be considered . Airway inflammation is a differential consideration and in the appropriate clinical setting , an acute process such as pneumonia would not be excluded . The lungs are hyperinflated . There are no pleural effusions or pneumothorax . Slight degenerative changes are present along the thoracic spine .
    OUTPUT:
    
Vague but somewhat focal interstitial opacification at the right lung base , highly nonspecific . Scarring atelectasis or airway inflammation could be considered ; in the appropriate clinical setting , if matching pulmonary symptoms are present , however , pneumonia would not be excluded .