Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral radiographs of the chest were obtained . The heart size and mediastinal contours are stable . No focal consolidation , pleural effusion or pneumothorax . Similar appearance of bibasilar atelectasis . No pulmonary edema
    OUTPUT:
    
Bibasilar atelectasis . No evidence of pneumonia