Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear , there is slight airspace opacity in the right base along the right heart border . There is no effusion , or pneumothorax . The heart size is stable , top normal . The mediastinal contours are unremarkable . Note is made of degenerative change of the visualized thoracic spine .
    OUTPUT:
    
No lobar pneumonia , slight right basilar opacity may be atelectasis , can not exclude an atypical pneumonia or bronchitis .