Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ at 11 :39 a .m . and allowing for technical differences , no definite change is identified . Again seen is patchy opacity in the right infrahilar region and at the left base ( previous chest x-ray suggested in the left lower lobe ) . Cardiomediastinal silhouette is unchanged . There is upper zone redistribution , without overt CHF . No new focal opacity is detected . No pneumothorax is identified . Densities in the upper abdomen likely relate to prior embolization .
    OUTPUT:
    
Allowing for technical differences , doubt significant interval change compared with earlier the same day . Again noted ( but better seen on the most recent prior study ) , are non-specific patchy opacities in the right middle and left lower lobes . Chest CT is recommended for further assessment of these opacities and for evaluation of the apparent interval increase in the size of the mediastinum compared with ___ .