Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe enlargement of the cardiac silhouette is in part due to the AP technique and supine positioning . Lung volumes are low . Persistent opacification of the left base probably represents atelectasis however superimposed consolidation can not be excluded . The right lung is clear . There is increased pulmonary vascular engorgement , but no pulmonary edema . No pneumothorax .
    OUTPUT:
    
1 . Cardiomegaly and increased pulmonary vascular engorgement without pulmonary edema . 2 . Low lung volumes and at least moderate atelectasis at the left base .