Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral ground - glass opacities sparing the right lung base have significantly improved . It was probably secondary to asymmetric pulmonary edema . Left lower lobe opacities , mostly due to atelectasis , are unchanged . Lung volumes are low . Right hilar region convexity is more pronounced today , of indeterminate significance . It does not have the usual shape of lobar atelectasis , and without prior chest x-ray before the surgery , it is difficult to assess if it is chronic or acute . There are some radiolucencies in this density . The ET tube is in adequate position . There is no pneumothorax . Unusual line is seen in left upper mediastinum , could be due to the projection only .
    OUTPUT:
    
1 . Patient with recent sigmoidectomy for diverticulosis . 2 . NG tube is in adequate position . 3 . Bilateral ground - glass opacities with sparing of right lower lung have improved and were probably secondary to atypical pulmonary edema . 4 . Right dense hilum convexity is more pronounced today and is of unknown etiology . It has an unusual shape for atelectasis . Chest CT is suggested . Dr . ___ has been verbally contacted for the results .