Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouettes appear within normal limits . Prominent / ectasia of the ascending aorta is similar to the prior studies . There are no focal pulmonary opacities , pleural effusions , or evidence of pneumothorax . Osseous structures appear unremarkable .
    OUTPUT:
    
Normal chest radiograph ; no evidence of pneumonia .