Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded and clear . No pleural abnormality . Radiographs dating back to ___ show progressive enlargement of the cardiomediastinal silhouette with now severe cardiomegaly and mild pulmonary vascular congestion . No pulmonary edema .
    OUTPUT:
    
Over the previous ___ years , this patient has developed progressive , now severe cardiomegaly . There is mild pulmonary vascular congestion without overt edema .