Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left - sided pneumothorax with collapse of the left lung . There is very slight shift of the mediastinum to the right and suggestion of slight widening of the rib interspaces on the left , raising concern for early tension . The right lung is clear . No pleural effusion is seen . The cardiac silhouette is top - normal size . Mediastinal contours are unremarkable .
    OUTPUT:
    
Large left - sided pneumothorax with findings worrisome for early tension .