Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . Subtle left basilar retrocardiac opacity seen on the frontal view , not substantiated on the lateral view is felt to most likely represent atelectasis . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
No acute cardiopulmonary process .