A case report of a giant functional parathyroid cyst without uptake by Tc-99m-methoxy-isobutyl-isonitrile （MIBI） scintigraphy

Abstract

We report a case of a giant functional parathyroid cyst without uptake identified by Tc-99m-methoxy-isobutyl-isonitrile （MIBI） scintigraphy. The case was a 74-year-old woman. The patient was admitted to our hospital because of hypercalcemia and high int-PTH. She was aware of dry mouth and general malaise. High caemia and high int-PTH were noted. CT scan and ultrasound found a cystic mass in the right neck and a solid mass in the left cervical thyroid gland and on the dorsal side. The results of cytology int-PTH showed a high value in the right cervical cyst, but MIBI scintigraphy showed abnormal accumulation in the left cervix. Pathological examination led to a diagnosis of right functional parathyroid cyst, left adenomatous goiter, and left parathyroid hyperplasia. One year has passed since the operation, and the course of recovery is good.