Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . The lungs are low in volume but clear aside from minimal basal / retrocardiac atelectasis or scarring . Interstitial prominence is likely due to chronic changes related to the congestive heart failure . No overt pulmonary edema or vascular congestion seen currently . The heart remains moderately enlarged with tortuous aortic contour . Dual lead pacemaker is noted . No pneumothorax or pleural effusion is seen .
    OUTPUT:
    
No acute intrathoracic process .