Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right base opacity may be due to atelectasis although an early infection or aspiration is not excluded . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . No pulmonary edema .
    OUTPUT:
    
Subtle right base opacity may be due to atelectasis although an early infection or aspiration is not excluded . No pulmonary edema .