Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe cardiomegaly is re- demonstrated with dense mitral annular calcifications . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . There is minimal patchy opacity in the retrocardiac region . No pleural effusion or pneumothorax is present . Mild degenerative changes are noted in the lower thoracic spine . Vascular stent is seen within the upper abdomen .
    OUTPUT:
    
Minimal retrocardiac opacity likely reflects atelectasis though infection can not be excluded in the correct clinical setting .