Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided AICD device is noted with leads terminating in unchanged positions . Abandoned pacer leads are also noted within the left chest wall . Severe cardiomegaly with left ventricular predominance is again noted . The mediastinal contour is unchanged . There is mild pulmonary vascular congestion , new in the interval . Retrocardiac streaky opacity likely reflects atelectasis . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Retrocardiac atelectasis and new mild pulmonary vascular congestion .