Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is mildly tortuous . There is mild upper zone vascular redistribution without overt pulmonary edema . No pleural effusion or pneumothorax is identified . Patchy opacity in the left lung base may reflect atelectasis but is nonspecific . Mild S - shaped scoliosis of the thoracic spine is present .
    OUTPUT:
    
Left basilar opacity may reflect atelectasis , but infection is not excluded . Mild cardiomegaly with mild upper zone vascular redistribution but without overt pulmonary edema .