Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest demonstrates normal lung volumes without pleural effusion , focal consolidation or pneumothorax . Hilar and mediastinal silhouettes are unchanged . Heart size is top normal . No pulmonary edema . Patient is status post medial sternotomy .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .