Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . The lungs show a mild background interstitial abnormality which is likely chronic but could also reflect mild interstitial congestion . A patchy left basiliar opacity is non-specific , but may reflect minor atelectasis . There is no pleural effusion or pneumothorax . Two mild to moderate compression deformities along the lower thoracic spine are of indeterminate age .
    OUTPUT:
    
1 . Mild interstitial abnormality which is non-specific . 2 . Patchy left lower lobe opacity which is not specific , which could reflect minor atelectasis , although an infectious etiology is not excluded in the appropriate clinical setting . 3 . Lower thoracic vertebral body compression deformities of indeterminate age ; correlate clinically .