Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This study appears to be unchanged from the prior examination . The heart is mildly enlarged as noted on the previous study as well . The cardiomediastinal contours are unremarkable . The lung fields are clear with no evidence of local infiltrate , pleural effusions , or pneumothorax . There is mild S - shaped scoliosis of the thoracic spine , which is also stable . The bony structures are intact .
    OUTPUT:
    
No significant changes since the prior study . No acute radiographic abnormalities .