Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is been slight interval decrease in size of the small to moderate right pleural effusion . Right basilar opacification likely reflects atelectasis though infection is not excluded . No pneumothorax is identified . Subsegmental atelectasis in the left lung base is present . The cardiac and mediastinal contours are unchanged .
    OUTPUT:
    
No pneumothorax . Small to moderate size right pleural effusion with persistent right basilar opacification possibly reflecting atelectasis but infection is not excluded . Left basilar linear atelectasis .