Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities of the lung bases bilaterally likely reflect atelectasis . Hyperlucency of the upper zones is reflective of emphysema . No focal consolidation , pleural effusion , or pneumothorax . Heart size and mediastinal contours are normal . Osseous structures are demineralized diffusely with a compression deformity in the mid thoracic spine which is unchanged from ___ .
    OUTPUT:
    
Emphysema and bibasilar atelectasis . No evidence of pneumonia .