Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate persistent small left - sided pleural effusion , which is not significantly changed from the prior study . Also seen is left basal pleural thickening with adjacent rounded atelectasis . The right lung is clear . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax , consolidation , or evidence of overt pulmonary edema .
    OUTPUT:
    
Small left - sided pleural effusion which is not significantly changed from the prior study . No overt pulmonary edema .