Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is mild peribronchial cuffing in both lower lungs , greater on the left than right , which can be seen with asthma , but no definite focal opacity to suggest superimposed pneumonia . There is no pleural effusion or pneumothorax . Mild degenerative changes are similar along the lower thoracic spine . Parenchymal detail is somewhat limited by soft tissue attenuation , and on the lateral , mild blurring .
    OUTPUT:
    
No evidence of pneumonia .