Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semiupright portable radiograph is compared to a study from ___ . Endotracheal tube , nasogastric tube and left subclavian catheter are in unchanged position . Left greater than right basal atelectasis and trace left are unchanged . No pneumothorax or right pleural effusion is seen . Heart is normal in size with normal cardiomediastinal contours .
    OUTPUT:
    
Unchanged bibasilar atelectasis and trace left effusion .