Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is within normal limits . Mediastinal contours are unchanged compatible with prior gastric pull - through and esophagectomy . The aorta is diffusely calcified . There is mild pulmonary vascular congestion . Opacification in the left lung base is noted with small left pleural effusion . Minimal patchy opacity in the right lung base may reflect atelectasis . No pneumothorax is demonstrated . Cholecystectomy clips are present in the right upper quadrant of the abdomen .
    OUTPUT:
    
Left basilar opacification may reflect a combination of atelectasis with small left pleural effusion , though infection or aspiration is not excluded . Mild pulmonary vascular congestion .