Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary bypass surgery . Cardiomediastinal contours are stable in appearance . There is no evidence of pulmonary edema or pneumonia . Minor areas of linear atelectasis are noted in the left mid and lower lung region as well as slight elevation of left hemidiaphragm .
    OUTPUT:
    
1 . No evidence of pulmonary edema . 2 . Linear atelectasis in left mid and lower lung regions .