Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is background hyperinflation with flattened diaphragms , suggesting COPD . Heart size is borderline enlarged , with a left ventricular configuration . Aorta is mildly unfolded . There is upper zone redistribution and mild vascular plethora , with possible trace bilateral effusions . There is mild bibasilar atelectasis . No frank consolidation . Superior endplate scalloping of a lower thoracic vertebral body is noted , unchanged .
    OUTPUT:
    
1 . Probable background COPD . 2 . Mild vascular plethora , without overt CHF . 3 . Bibasilar atelectasis . No frank consolidation . An early infiltrate can not be entirely excluded .