Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable chest radiograph demonstrates stable severe cardiomegaly with mild interstitial pulmonary edema . No pleural effusions identified . Retrocardiac opacification likely reflects atelectasis related to stable significant left hemidiaphragm elevation . Mediastinal and hilar contours are unchanged .
    OUTPUT:
    
Mild interstitial pulmonary edema . Stable massive cardiomegaly . No pleural effusions .