Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is atelectasis at the left lung base . Previously seen mediastinal lymphadenopathy is not well evaluated on radiograph . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Previously seen mediastinal lymphadenopathy is not well evaluated on radiograph , for which tissue sampling is recommended .