Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Mild elevation of the right hemidiaphragm is again noted . There is improved aeration in the lower lungs as compared with recent study . No convincing signs of pneumonia , edema , effusion or pneumothorax . The heart appears within normal limits . Mediastinal contour is stable . Bony structures are intact appear
    OUTPUT:
    
No acute findings . Improved aeration in the lower lungs as compared with ___ .