Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Heart size is normal . Prominence of the right paratracheal stripe may be due to prominent vasculature . Low lung volumes are present with crowding of bronchovascular structures . No overt pulmonary edema is present . Elevation of the right hemidiaphragm is of unknown chronicity . No focal consolidation , pleural effusion or pneumothorax is present . Clips are noted at the gastroesophageal junction .
    OUTPUT:
    
Low lung volumes without acute cardiopulmonary process . Elevation of the right hemidiaphragm of unknown chronicity .