Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate stable severe cardiomegaly . Mediastinal and hilar contours are unremarkable . Defibrillator lead is positioned in the right ventricle . On a background of emphysema and chronic lung changes , there are bibasilar reticular and linear opacifications , likely reflecting superimposed atelectasis in the setting of low lung volumes . No overt pulmonary edema evident . No pleural effusions .
    OUTPUT:
    
Stable severe cardiomegaly . Faint bibasilar opacifications on background emphysema and chronic lung disease likely reflect atelectasis . No overt pulmonary edema .