Anatomy clinical correlates Quiz: Ace Your Exams

A 13-year-old boy presents to the pediatrician for a well-child visit and raises a concern for recent voice changes. The patient has noticed a deepening and hoarseness of his voice over the past eight weeks and is worried “something is wrong with my voice box.” His parent reports the patient has been sleeping 10-12 hours per day and had a “head-cold” two months ago. The patient is otherwise healthy and does not take any medications. He does not smoke, use illicit drugs, or consume alcohol. Vital signs are within normal limits. Physical examination demonstrates a tall, thin male in no acute distress with comedonal acne noted on the face. The patient’s posterior oropharynx is without evidence of edema, exudates, or erythema. There is no tenderness to palpation of the trachea. When asked to speak, the patient's voice intermittently enters higher frequency registers. Which of the following is the most likely etiology of this patient's clinical presentation?