Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without effusion or pneumothorax . Linear bibasilar opacities are likely atelectasis . Rounded opacity projects over the anterior left third rib , potentially either within the rib or within the underlying lung parenchyma . The cardiomediastinal silhouette is within normal limits for technique . Atherosclerotic calcifications noted at the aortic arch . No displaced fractures identified .
    OUTPUT:
    
No acute cardiopulmonary process . Nodular opacity projecting over the left anterior third rib .