Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a left chest pacemaker with the single lead overlying the right ventricle . Severe cardiomegaly is unchanged . The mediastinum , hila and vasculature , lungs , and pleural surfaces are normal .
    OUTPUT:
    
Unchanged severe cardiomegaly ; otherwise normal chest radiograph without vascular congestion or pulmonary edema . A preliminary read was provided , upon request , via telephone by Dr . ___ ___ to the office of Dr . ___ . A message was left with ___ ___ at the answering service at ___ on ___ .