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 pulmonary vascularity is normal . Mild linear opacities are noted in both lung bases , most likely reflective of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is visualized . Degenerative changes of the acromioclavicular joints are noted bilaterally , right greater than left .
    OUTPUT:
    
Linear opacities at the lung bases most likely reflective of subsegmental atelectasis .