Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A left subclavian central venous catheter terminates at the upper SVC . A right thoracostomy tube is unchanged in position . There is no pneumothorax , focal consolidation , or pleural effusion . Mild bibasilar atelectasis seen on the ___ radiograph has improved .
    OUTPUT:
    
No pneumothorax . Improved bibasilar atelectasis .