Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for technique , the cardiac and mediastinal silhouettes are within normal limits . There appears to be a left - sided chest tube with the tip in the region of the left cardiophrenic angle . Otherwise , the lungs appear essentially clear and without appreciable change compared to the examination from ___ .
    OUTPUT:
    
No evidence of pleural effusion or pneumothorax .