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.