Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Lungs are clear and the pulmonary vascularity is normal . Minimal blunting of the left costophrenic sulcus posteriorly suggests a trace left pleural effusion . No right - sided pleural effusion or pneumothorax is present . There are minimal degenerative changes in the thoracic spine .
    OUTPUT:
    
Trace left pleural effusion . Otherwise , no acute cardiopulmonary abnormality .