Intraoperative Post-parathyroidectomy Correlation of PTH Hormone Values with Preoperative Scintigraphy

Preoperative parathyroid evaluation through nuclear medicine and intraoperative hormone monitoring has significantly increased the success of the surgical intervention. Material and method: Our study is descriptive, the database is retrospective but it is maintained prospectively. The preoperative protocol included single photon emission computed tomography (SPECT) with the use of technetium-99 sestamibi tracer. We preferred this approach as it allowed 3-D localization of the adenomas. PTH values were obtained from blood drawn from the ipsilateral jugular vein at the regular intervals of 5, 10 and 15 minutes post excision. Results: We had 6 cases with false negative which led to the necessary dissection of the contralateral neck. Two had previous surgery and 4 had tumors in other locations which were observed after the surgical intervention through methodical investigations. We encountered 3 patients with false positive results. 2 had intrathyroidal adenomas and 1 was diagnosed with thyroid papillary carcinoma. Causes of a misinterpretation are related to thyroid disease in association with hyperparathyroidism, a history of parathyroid surgery or multiple locations of hyperproductive parathyroid glands.