Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been no significant interval change . There is a small left pleural effusion with adjacent atelectasis . Irregular interstitial markings in combination with hyperinflation are compatible with underlying emphysema . Mild cardiac enlargement is stable . Vertebral body height loss noted in the thoracic spine but not particularly well assessed on the current exam due to osteopenia and technique .
    OUTPUT:
    
Persistent small left pleural effusion . No definite superimposed acute cardiopulmonary process .