<prompt> PA view of chest X-ray is given here. What is the diagnosis?Right Pneumothorax with right tracheal shiftRight Pneumothorax with left tracheal shiftLeft Pneumothorax with left tracheal shiftLeft Pneumothorax with right tracheal shift  <response>: Given image is showing absent bronchioalveolar markings of right lung with tracheal shift towards left side which is suggestive of right pneumothorax. Pneumothorax: presence of air or gas in pleural cavity Also remember, Deep sulcus sign on supine chest X-ray in expiration phase is a feature of pneumothorax. 