Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph was obtained . A dual - lead pacer is in unchanged position . The heart is moderately enlarged . Low lung volumes without definite signs of consolidation , effusion , or pneumothorax . Bony structures are intact .
    OUTPUT:
    
Cardiomegaly . No signs of aspiration or pneumonia .