Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP view of the chest provided . ET tube and orogastric tube position are stable . The retrocardiac and left basilar opacities are significantly improved from ___ and likely represent atelectasis . No pleural effusion or pneumothorax . Hilar contours are normal . The heart , again appears mildly shift to the left , however this is likely projectional .
    OUTPUT:
    
Retrocardiac and left basilar opacities , likely representing atelectasis , are resolved from ___ . Otherwise , no significant changes from the previous examination .