Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large right - sided pneumothorax . No definite signs to suggest tension . Subcutaneous gas projects over the right chest wall . No displaced rib fractures identified . There is subtle angulation of the right lateral fifth rib . There is right lower lobe atelectasis . Cardiomediastinal silhouette is within normal limits . Left lung is clear .
    OUTPUT:
    
Large right pneumothorax . No displaced rib fractures identified although angulation of the right lateral fifth rib raises possibility of underlying fracture .