In evaluating a 16-month-old boy, the respiratory therapist…

Questions

In evаluаting а 16-mоnth-оld bоy, the respiratory therapist finds him to be in mild respiratory distress, without a fever, but with a barking-type cough. A lateral neck x-ray taken in the emergency department shows a “steeple point” narrowing of the trachea. Based on this information, which of the following would the respiratory therapist conclude is the most probable diagnosis?