Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is moderate to severely enlarged with a somewhat globular configuration . The mediastinal and hilar contours are unremarkable . There is mild pulmonary vascular congestion . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormality seen .
    OUTPUT:
    
Moderate to severe enlargement of cardiac silhouette likely due to cardiomegaly with mild pulmonary vascular congestion . Echocardiogram may be helpful to exclude an underlying pericardial effusion .