Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest demonstrates low lung volumes , which accentuate bronchovascular markings . There is near - complete resolution of bilateral pleural effusions seen on ___ exam . There is no pneumothorax or focal consolidation . Streaky opacity in the left juxtahilar region along with mild prominence of the pulmonary vascularity likely reflects mild interstitial edema , which is improved compared to the prior study . Heart is mildly enlarged . Mediastinal contour is slightly widened , which is most likely due to low lung volumes and patient positioning . Post - surgical changes related to median sternotomy and CABG are again noted .
    OUTPUT:
    
1 . Low lung volumes . Mild interstitial pulmonary edema , improved from the previous exam . 2 . Near - complete interval resolution of bilateral pleural effusions since ___ . 3 . Prominent mediastinal silhouette is most likely due to low lung volumes and patient 's positioning . A repeat conventional PA and lateral radiographs will be helpful , when tolerated .