Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable loculated hydro pneumothorax in the right costophrenic angle with associated basal atelectasis . Within the left lung base is minimal subsegmental atelectasis . The lungs are otherwise clear . The cardiomediastinal silhouette as compared with prior sternotomy and aortic valve replacement .
    OUTPUT:
    
No significant interval change