Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Detailed evaluation of the lung apices is slightly limited due to overlying soft tissue from the chin . Nonspecific opacities in the retrocardiac region are much improved . Persistent linear opacities in the left retrocardiac region may reflect linear atelectasis and / or scarring . The cardiomediastinal silhouette is unchanged . No pleural effusion or pneumothorax . Median sternotomy wires appear intact and unchanged . Posterior spinal fixation hardware in the lumbar spine appear grossly intact . Calcifications of the aorta are extensive . No acute osseous abnormality .
    OUTPUT:
    
No acute cardiopulmonary process .