Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unchanged with continued elevation of the left hilus . Prominence of the hila bilaterally reflects the previously demonstrated soft tissue which encases the hilar regions and tracts along the lower lobe airways , as seen on the recent CT . Pulmonary vasculature is not engorged . Small left pleural effusion may be slightly increased in size compared to the previous study . Atelectasis is seen in the left lung base . Aeration in the right base is improved with decreased extent of the previously noted patchy right basilar opacity . No new focal consolidation is present . There is no pneumothorax .
    OUTPUT:
    
1 . Improved aeration in the right base with decreased right basilar patchy opacity thought to reflect airways disease on the previous CT . 2 . Small left pleural effusion , perhaps slightly increased in the interval . 3 . Unchanged abnormal appearance of the hilar contours , reflective of prior radiation treatment and known soft tissue encasement , as seen on the prior CT .