Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains moderately enlarged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unchanged . There is no pulmonary vascular congestion . Streaky bibasilar opacities likely reflect atelectasis . No large pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild bibasilar atelectasis .