Review Question - QID 211051

A 5-year-old boy presents to the emergency department with heavy drooling. The patient was being watched by his babysitter when she found him. He has no significant medical history and was in a normal state of health when his parents left in the morning. His temperature is 99.1°F (37.3°C), blood pressure is 107/58 mmHg, pulse is 119/min, respirations are 14/min, and oxygen saturation is 98% on room air. Physical exam is notable for a young boy in acute distress who is drooling. The boy is in visible distress and does not seem to be able to swallow. The patient’s tongue seems abnormally enlarged and erythematous. Which of the following is the most likely diagnosis?