Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size is mildly enlarged . The mediastinal and hilar contours are unchanged . Crowding of bronchovascular structures is likely related to low lung volumes . Streaky opacities in the lung bases likely reflect areas of atelectasis . No large pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar streaky opacities , likely atelectasis in the setting of low lung volumes . Infection is not completely excluded in the correct clinical setting .