Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest was obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar study of ___ . There is status post sternotomy , apparently related to previous bypass surgery . Moderate cardiac enlargement is noted . The pulmonary vasculature demonstrates an upper zone redistribution pattern and diffuse haze over the bases is consistent with interstitial edema . The previously described superimposed patchy and partially confluenting parenchymal infiltrates have regressed slightly , but persist to some degree bilaterally . The right - sided diaphragm can now be identified again , so that major pleural effusion is unlikely . If evaluation of pleural effusion is essential , one should consider the performance of a lateral view as well .
    OUTPUT:
    
Mild improvement of previously identified scattered parenchymal infiltrates superimposed on chronic CHF .