Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A right thoracostomy tube is present . An orogastric tube terminates just above the diaphragm . There is no pneumothorax . Bibasilar linear opacities are most compatible with atelectasis in the setting of low lung volumes . A left retrocardiac opacity remains unchanged . The findings are minimally changed since the prior examination .
    OUTPUT:
    
No pneumothorax . Minimal change since the radiograph from ___ at 17 :31 .