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April 11, 1980

Differentiation of Thyroid From Parathyroid Cysts

Author Affiliations

Associated Endocrinologists-Northland Thyroid Laboratory Southfield, Mich

JAMA. 1980;243(14):1422. doi:10.1001/jama.1980.03300400012010

To the Editor.—  Since our last communication (241:357, 1979) regarding the presumptive diagnosis of parathyroid cysts by needle aspiration, we have acquired additional data. The first case that we presented with the presumptive diagnosis of parathyroid cyst has since gone to surgery and has, in fact, proved to be a benign parathyroid cyst. This patient had had two cystic aspirations and decided that she preferred surgical excision to further medical management.In an additional case of an apparent parathyroid cyst 8.2 mL of watery-like fluid was examined. The cyst thyroxine value was 1.4 μg/dL, and the serum value was 8.4 μg/dL (normal serum range, 5.5 to 11.5 μg/dL). The cyst intact parathyroid hormone value was 2,075 pg/mL, and the serum intact parathyroid hormone value was 339 pg/mL (normal serum range, 163 to 347 pg/mL). The cyst C-terminal parathyroid hormone value was 49,666 pg/mL, and the serum intact1,2 parathyroid hormone