Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device with leads terminating in the right atrium and right ventricle is re - demonstrated . Heart size remains moderately enlarged but unchanged . Mediastinal contours similar . There is mild perihilar haziness with vascular indistinctness and increased interstitial markings compatible with mild interstitial pulmonary edema . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is identified .
    OUTPUT:
    
Mild interstitial pulmonary edema .