Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe cardiomegaly remains unchanged . Lung volumes remain low accentuating the cardiomediastinal silhouette . Left - sided pacemaker remains in adequate position with leads terminating in the right atrium and right ventricle . As compared to prior chest radiograph from ___ , interstitial pulmonary edema has slightly increased . The stomach is distended . There is no definite evidence of free air in this limited examination . For a complete evaluation of free air , however , upright radiographs or CT should be performed . Right IJ central venous catheter terminates in the upper SVC .
    OUTPUT:
    
1 . Slight increase of mild to moderate interstitial pulmonary edema . 2 . Distended stomach . No definite evidence of free air in this limited examination . For a complete evaluation of free air , however , upright radiographs or CT should be performed .