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Question: A 38 year old female is referred for hoarseness following thymoma excision.  She has never had prior neck surgery.  Laryngoscopy reveals a left true vocal fold paralysis.  She undergoes injection of Cymetra with a good voice result and returns 6 months later as her voice quality has diminished.  You elect to perform a reinnervation procedure.  What donor nerve is most commonly used for laryngeal reinnervation, and would be appropriate in her case?    [Answer will be posted with next week's new question]

Answer to last week's question, "Metabolic Pathways" (November 27, 2017)

Urine leukotriene E4.