“…PCs can be classified as functional and non-functional cysts according to their co-occurrence with hyperparathyroidism. [1,2,6] Although most of these cysts (85-90%) are non-functional, according to the size of the lesion and local compression, symptoms such as pain dyspnea, dysphagia, and hoarseness due to recurrent laryngeal nerve damage are reported. Of the cysts, 10-15% may be functional and they may manifest with acute parathyroid crisis.…”