Jiraporn SriprapapornPongthep PisarnturakitTauangtham AnekpuritanangFaculty of Medicine, Siriraj Hospital, Mahidol University2020-12-282020-12-282020-10-01Journal of Health Science and Medical Research. Vol.38, No.4 (2020), 337-34226300559258699812-s2.0-85097800286https://repository.li.mahidol.ac.th/handle/20.500.14594/60586© 2020 JHSMR. Hosting by Prince of Songkla University. All rights reserved. Although the occurrence of thyroid and parathyroid diseases is common, concomitant parathyroid adenoma and papillary thyroid carcinoma is rare. We report the case of a 77-year-old Thai woman who was diagnosed to have papillary thyroid carcinoma and postoperative hypercalcemia. The primary hyperparathyroidism was initially overlooked but was subsequently confirmed to be due to a single occult parathyroid adenoma demonstrated on technetium-99m sestamibi (Tc-99m MIBI) parathyroid scintigraphy. Thus, preoperative evaluation of parathyroid disease should be performed if there is evidence of hypercalcemia prior to the thyroid surgery. Presurgical evaluation with Tc-99m MIBI parathyroid single-photon computed tomography/computerized tomography imaging has a definite role in localizing a hyperfunctioning parathyroid gland in the cases of primary hyperparathyroidism.Mahidol UniversityMedicineArticleSCOPUS10.31584/jhsmr.2020751