Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and cardiac valve replacement . Right - sided Port - A - Cath is seen with catheter terminating in the low SVC / cavoatrial junction . Patchy right base opacity is seen , which may be chronic , could be due to atelectasis , consolidation , but overall appears less extensive as compared to the chest radiograph from ___ . There is also subtle left base opacity , pneumonia not excluded . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Persistent right base opacity appears less extensive as compared to ___ . Please see prior chest CT . Left base opacity could be due to pneumonia .