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 effusion , or evidence of pneumothorax . Osseous structures are unremarkable aside from mild degenerative changes of the thoracic spine .
    OUTPUT:
    
No evidence of pneumonia or other acute cardiopulmonary disease .