Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate - to - severe cardiomegaly is unchanged with a left - sided dual - lead pacer remaining in unchanged position . Mediastinal and hilar contours are unremarkable . There is mild central pulmonary vascular congestion with mild interstitial edema . Lungs are otherwise clear without focal consolidation . There is no effusion or pneumothorax .
    OUTPUT:
    
Moderate - to - severe cardiomegaly with minimal pulmonary edema , improved compared to prior study .