Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , CABG , with vascular stents noted in the anterior mediastinum . Heart size is normal . Mediastinal and hilar contours are stable . Diffuse ill - defined nodular opacities are again noted , right greater than left , which appear perhaps minimally improved compared to the prior chest radiograph . Bibasilar streaky opacities could reflect atelectasis but infection or aspiration is not excluded . There is no pulmonary edema . Blunting of the costophrenic angles bilaterally may indicate pleural trace pleural effusions . There is no pneumothorax . No acute osseous abnormalities are seen .
    OUTPUT:
    
1 . Diffuse ill - defined nodular opacities , slightly improved compared to the prior chest radiograph study . Differential considerations include Langerhans cell histiocytosis if the patient is a smoker , infection including fungal organisms , or other inflammatory process . Comparison with any prior chest CT imaging is recommended since ___ , and if this has not been performed , then HRCT of the chest can be obtained for further assessment . 2 . Bibasilar airspace opacities are more focal compared to the prior study and could reflect atelectasis , but infection or aspiration can not be excluded .