Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are slightly decreased lung volumes . There is a subtle opacity overlying the medial right lung base , which most likely reflects overlying breast tissue . The lungs are otherwise clear . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Subtle opacity overlying the medial right lung base , which most likely reflects overlying breast tissue . If clinically indicated , could obtain lateral radiograph for further characterization .