Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Cardiac silhouette size is mildly enlarged . Mediastinal and hilar contours are unremarkable . Low lung volumes are present with crowding of bronchovascular structures , but no overt pulmonary edema is present no focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes without acute cardiopulmonary process .