Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compare with ___ at 11 :18 ( earlier the same day ) , there has been interval improvement in the appearance of the right lung . The area of dense thickening seen along the expected course of the minor fissure is significantly improved , though it remains partially visible , suggesting interval re-expansion of portions of the right lung . Patchy opacity however remains visible in the aerated portions of the right lung . The right hemidiaphragm remains elevated , with blunting of the right costophrenic angle , and a small amount of pleural thickening along the right chest wall on the lung apex . The right paratracheal soft tissue density remains thickened . As before , the cardiomediastinal silhouette remains midline and appears overall unchanged . The right hilum , as before , is obscured by surrounding opacities . Also , as before , left lung remains grossly clear , without CHF focal consolidation or effusion . Minimal atelectasis is now noted .
    OUTPUT:
    
Interval improvement in the degree of aeration of the right lung . Background patchy opacities remain visible throughout much of the aerated portion of the right lung . The most likely differential are pneumonic infiltrates , extensive aspiration , or asymmetric CHF , but other etiologies can not be excluded . The left lung remains grossly clear , with minimal atelectasis at the base .