Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ , atelectasis in the right cardiophrenic region has improved . Otherwise , I doubt significant interval change . As before , the aorta is calcified minimally unfolded . The heart is not enlarged . No CHF , focal infiltrate , or effusion is identified . No pneumothorax is seen . The parenchymal changes identified on the ___ chest CT ( mosaic attenuation ) are not appreciated radiographically .
    OUTPUT:
    
No acute pulmonary process identified .