Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . There is a large left - sided pneumothorax with significant collapse of the left lung . There is minimal tracheal deviation to the right though no convincing signs of tension pneumothorax . No pleural effusion . Right lung is clear . Heart size is normal . Bony structures intact .
    OUTPUT:
    
Large left pneumothorax , no convincing signs of tension .