Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post CABG with median sternotomy wires . The heart size is top normal . Heavy calcification of the aortic knob is noted with tortuosity of the descending aorta . There is no pneumothorax or pleural effusion . Lung volumes are low , and increased interstitial markings indicate mild interstitial edema . There is no focal consolidation concerning for pneumonia .
    OUTPUT:
    
Low lung volumes with mild interstitial edema . No focal consolidation concerning for pneumonia .