A 52yo man whose voice became hoarse following thyroid surgery 1 wk ago shows no
improvement. Which anatomical site is most likely affected?
a. Bilateral recurrent laryngeal nerve
b. Unilateral recurrent laryngeal nerve
c. Unilateral external laryngeal nerve
d. Bilateral external laryngeal nerve
e. Vocal cords
answer: B
Unilateral RLN = hoarseness
Bilateral RLN = aphonia
ELN = weakness, inability to raise voice pitch
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