Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity at the right cardiophrenic angle is felt to most likely represent overlap of vascular structures , as seen on prior chest radiograph . No definite focal consolidation is seen . There is no pleural effusion or pneumothorax . There is no pulmonary edema . The cardiac silhouette is mildly enlarged , not significantly changed . Mediastinal and hilar contours are stable .
    OUTPUT:
    
Subtle right cardiophrenic opacity most likely represents overlap of vascular structures with possible underlying atelectasis .