Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette and hilar contours are unchanged from prior exam . Incidental note is made of an azygos fissure . Architecture at the base of the azygos fissure is somewhat complicated ; however , there has been no change in appearance since ___ . Lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of pneumonia .