Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle right base opacity is more likely due to atelectasis or overlap of vascular structures rather than pneumonia . . The left lung is clear . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle right base opacity is more likely due to atelectasis or overlap of vascular structures rather than pneumonia