Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are stable with mild to moderate cardiomegaly . This pacer leads are in standard position . Aside from minimal linear scarring in the left upper lobe , the lungs are clear . There is no pneumothorax or pleural effusion . The osseous structures are unremarkable
    OUTPUT:
    
No acute cardiopulmonary abnormalities