FNAs of the parathyroid can be easily confused with that of the thyroid, not only because of the clinical similarity between these two types of lesions but also because of the overlap in cytomorphologic features of the aspirated cells. Although no one single cytomorphologic feature is diagnostic, a combination of cytologic parameters noted earlier should raise the possibility of a parathyroid lesion. Aspirates of parathyroid cysts show acellular water-clear fluid with elevated parathyroid hormone measurements.

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