Detection of Ectopic Mediastinal Parathyroid Adenoma on Myocardial Perfusion Scintigraphy with 99mTc-Tetrofosmin.

Parathyroid ectopia may occur in various anatomical regions and is caused by abnormal embryological migration of the parathyroid glands. Ectopic parathyroid adenomas account for 6%-16% of cases of primary hyperparathyroidism. We present the case of a mediastinal ectopic adenoma detected on myocardial perfusion imaging with 99m Technetium (99mTc)-tetrofosmin in a 64-year-old patient. Incidental extracardiac 99mTc-tetrofosmin uptake in mediastinal ectopic parathyroid adenomas has been rarely reported in the literature. Our case is rare as it represents a small proportion of all ectopic parathyroid adenomas.