Sudden dysphonia due to parathyroid apoplexy: a rare case of recurrent laryngeal nerve palsy.

A case is presented of sudden onset dysphonia in a 59-year-old man caused by acute vocal cord paralysis due to bleeding within a hyperplastic lower right parathyroid gland. There were no laboratory findings of hyperparathyroidism nor coagulation disorder. Acute onset of vocal cord paralysis is rarely associated with benign processes; the current case is the first associated with parathyroid hyperplasia.