Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a cardiac device generator in the right chest wall with leads terminating in the right atrium and right ventricle . There is improved aeration of the upper left lung with resolution of previously described ill - defined interstitial and patchy airspace opacities . Bibasilar opacities are grossly unchanged including abscess duration of the medial left hemidiaphragm . There is unchanged blunting of the right costophrenic angle . The cardiomediastinal silhouette , pulmonary vasculature , and aorta are within normal limits . The visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . Resolution of previously described left upper lung interstitial opacities . 2 . Unchanged bibasilar opacities including retrocardiac opacification may represent atelectasis , however in the appropriate clinical setting superimposed pneumonia is difficult to exclude .