Hyperparathyroidism in high-risk surgical patients: evaluation with double-phase technetium-99m sestamibi imaging.
PURPOSE: To evaluate the accuracy of technetium-99m sestamibi as a single agent in the detection and localization of hyperfunctioning parathyroid tissue in patients who underwent prior neck exploration or who otherwise are high surgical risks. MATERIALS AND METHODS: Thirty-nine patients with hyperparathyroidism underwent 40 double-phase Tc-99m sestamibi studies. Histopathologic correlation was obtained for all studies. RESULTS: Thirty patients had solitary adenomas, and nine had hyperplastic glands. One developed recurrent hypercalcemia after five-gland resection and underwent repeat imaging and operation. Double-phase sestamibi imaging prospectively enabled localization of 46 (77%) of 60 abnormal glands. Twenty-eight (93%) of 30 adenomas were correctly localized, whereas 18 (60%) of 30 hyperplastic glands were localized. The overall specificity of the study was 98% with one false-positive study. Gland weight and vascularity were statistically significant predictors of uptake of sestamibi. CONCLUSION: Double-phase Tc-99m sestamibi imaging is a promising technique for localization of parathyroid adenomas in high-risk surgical patients. Localization of multiple hyperplastic glands remains a challenge.
Lee, VS; Wilkinson, RH; Leight, GS; Coogan, AC; Coleman, RE
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