Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta remains unfolded . The mediastinal and hilar contours are otherwise within normal limits . Pulmonary vasculature is not engorged . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . Moderate degenerative changes are seen within the imaged thoracolumbar spine with posterior fusion hardware in the upper lumbar spine incompletely imaged . Minimal cortical irregularity of the left twelfth rib reflects the findings seen on recent CT and is suggestive of a possible acute fracture .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild cortical irregularity of the left twelfth rib again may reflect a possible acute fracture .