Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is unchanged . The mediastinal and hilar contours are unremarkable . The distal tracheal stent is re - demonstrated but poorly visualized . There is no pulmonary vascular congestion . Linear opacities within the lung bases likely reflect atelectasis . No pleural effusion , focal consolidation or pneumothorax is identified .
    OUTPUT:
    
Mild bibasilar atelectasis .