Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . Lung volumes are low , though there is no focal consolidation , large effusion , or pneumothorax . The heart is mildly enlarged . No signs of CHF or edema . Bony structures are intact .
    OUTPUT:
    
Mild cardiomegaly , otherwise unremarkable .