Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouettes are within normal limits . There no focal pulmonary opacities , pleural effusions , or evidence of pneumothorax . Osseous structures are unremarkable . When compared to the prior examination , there is improvement in the right middle lobe changes without new opacity .
    OUTPUT:
    
No evidence of acute cardiopulmonary process