Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . A discrete nodular focus projects inferior to the left hilum near the left cardiac border . It may represent a normal vascular structure but at least raises some concern for a nodule . When clinically appropriate , repeat views with standard PA and lateral technique are recommended to assess further .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Possible left infrahilar nodule versus a normal vascular structure . When clinically appropriate , repeat PA and lateral radiographs are recommended to assess further . A preliminary report regarding the findings and recommendations was posted to the ER department dashboard while the patient was still in the emergency room .