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The prevalence of multiglandular disease (MGD) of the parathyroid has been reported to be higher in patients with primary hyperparathyroidism and low baseline intact parathyroid hormone (PTH) levels (100 pg/mL). Low baseline PTH is associated with lower localization rate and positive predictive value with both preoperative sestamibi and ultrasound. This study sought to evaluate our experience with four-dimensional computed tomography (4D-CT) for the localization of abnormal parathyroid glands, including MGD, in patients with low baseline intact PTH (LBiPTH).A single institution case series.A case series of patients with primary hyperparathyroidism with low baseline PTH or an inconclusive sestamibi, who underwent surgery with a single surgeon from April 2012 to June 2015 following 4D-CT to help with abnormal gland localization.We identified 14 patients who underwent a 4D-CT in the setting of primary hyperparathyroidism and LBiPTH. A sestamibi scan had been ordered in 71% and was inconclusive in all cases. No ultrasound was performed. In all patients, 4D-CT was 84.6% sensitive in localizing abnormal glands, yielding a positive predictive value of 91.7%. Overall, 42.9% of patients had evidence of MGD, and 4D-CT detected 83.3% of MGD cases. A focused unilateral exploration was performed in 28.6% of cases, and a four-gland exploration was performed in all remaining patients.In patients with hypercalcemia and LBiPTH, with higher likelihood of MGD and of inconclusive results on sestamibi, 4D-CT may be a superior modality for localizing smaller adenoma or multiple hypercellular glands. This may allow for improved interpretation of intraoperative PTH results, and in a minority of cases, a focused parathyroid exploration.4 Laryngoscope, 127:1476-1482, 2017. |
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