Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are unchanged . Tortuosity of the aorta and atherosclerotic calcifications are re - demonstrated . No pulmonary edema , pneumothorax , or pleural effusion . No consolidations are seen . Radiopaque density within the right upper quadrant is compatible with known right staghorn calculus , unchanged since ___ .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Unchanged right staghorn calculus , stable since ___ .