Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded with mild left lower lobe atelectasis . No pleural effusion or pneumothorax . A density projecting along the right upper mediastinum is stable dating back to ___ and consistent with prominent vasculature as confirmed on chest CT from ___ . Heart size , mediastinal contour , and hila are otherwise unremarkable . Mildly tortuous aorta noted . Mediastinal clips are again seen with intact median sternotomy wires consistent with prior CABG . Visualized abdomen is notable for a small hiatal hernia .
    OUTPUT:
    
1 . No acute cardiopulmonary process . No pneumonia . 2 . Small hiatal hernia . 3 . Stable right upper mediastinal prominence .