Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest tube points towards the apex and appears unchanged in position . There is a lucency adjacent to the left heart border extending inferiorly deep into the left lateral sulcus . This is highly suggestive of an anterior pneumothorax . Cardiomediastinal contours are unchanged . Lungs are clear . No pleural effusions .
    OUTPUT:
    
Left anterior pneumothorax . Upright or right lateral decubitus radiographs are recommended for evaluation and confirmation .