Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Patient rotation slightly limits assessment . The patient is status post median sternotomy and CABG . Cardiac silhouette size remains mildly enlarged . The aorta is unfolded . There is mild bronchovascular crowding and possible mild pulmonary vascular congestion . Streaky left basilar opacity likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormalities are present .
    OUTPUT:
    
Low lung volumes with left basilar streaky opacity likely reflecting atelectasis . Mild pulmonary vascular congestion .