Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain clear , without focal consolidation to suggest pneumonia . There is no pleural effusion . There is no pneumothorax . Hilar and cardiomediastinal contours are unchanged , with persistent tortuosity of the descending aorta . There is no pulmonary vascular congestion or edema . The pleural surfaces are smooth . Degenerative changes are again seen in the thoracic spine .
    OUTPUT:
    
No evidence of pneumonia . No evidence of malignancy within the limitations of chest radiograph .