Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated and clear bilaterally with mild flattening of hemidiaphragms consistent with COPD . There are no areas of focal consolidation , mass lesions , pleural effusion or evidence of pneumothorax . The cardiomediastinal silhouette demonstrates mildly tortuous aorta . Heart is within normal limits . The pleural surfaces are unremarkable . There is demineralization of the thoracic spine with hyperkyphosis of the mid thoracic spine .
    OUTPUT:
    
No evidence of infection or malignancy .