Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re-identified are multiple median sternotomy wires consistent with prior CABG . The cardiomediastinal silhouette is stable , reflective of moderate cardiomegaly . The hila are within normal limits . Lung volumes are low . There is no pulmonary vascular congestion or pulmonary edema . Linear opacity at the right and left lung bases likely reflect atelectasis . There is no pneumothorax or pleural effusion . The right internal jugular vein catheter has been removed . At lower lung volumes , a platelike atelectasis is seen at the right lung basis .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process . Bibasilar atelectasis . Stable moderate cardiomegaly .