Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . Due to extreme kyphotic posture , evaluation through the lung bases is somewhat limited . Allowing for this , there is no focal consolidation , effusion , or pneumothorax . There are bibasilar linear opacities , which appear stable from prior , may represent chronic scarring or atelectasis . Cardiomediastinal silhouette appears grossly stable with a slightly unfolded thoracic aorta . Bony structures are intact . There is no compression fracture seen .
    OUTPUT:
    
No acute intrathoracic process .