Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiographs obtained approximately ___ years prior , no significant changes are appreciated . Mild elevation left hemidiaphragm and adjacent linear opacities consistent with scarring are unchanged . Adjacent abnormal rib contours may be consistent with prior trauma . Lungs are mildly hyper inflated , but clear without focal consolidations or suspicious pulmonary nodules . No pleural effusions . Biapical pleural thickening is unchanged . Heart size is top normal . Thoracic aorta is tortuous , but unchanged . Cardiomediastinal hilar silhouettes otherwise unremarkable .
    OUTPUT:
    
No radiographic evidence of pneumonia or acute cardiopulmonary abnormalities .