Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unremarkable . There is a persistent left basilar opacity with volume loss which has long chronicity , but decreased since the most recent prior study . Corresponding mild elevation of the left hemidiaphragm is similar . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Similar chronic opacity at the left lung base with resolution of relative increased on recent chest radiography .