The goal of this observational study is to evaluate the efficacy of PTeyeTM device to confirm a parathyroid adenoma on a visually suspected tissue in comparison with the FLUOBEAM®LX device. The main questions it aims to answer is:

Is the PTeyeTM device effective in identifying the presence of a parathyroid adenoma? Which autofluorecence device (PTeye or FLUOBEAM®LX) is more effective in confirming the presence of a parathyroid adenoma? Participants will undergo parathyroidectomy under general anesthesia. During the procedure visually suspected tissue for parathyroid adenoma will be evaluated with the PTeye or FLUOBEAM®LX device for the presence of an adenoma (minute 0). Tissue will be reevaluated on minutes 1, 3, and 5 and before excision.

Objective: PTeye™ and FLUOBEAM® LX use autofluorescence to confirm visually suspected parathyroid tissue. Real-time intraoperative identification of parathyroid glands can be achieved by the application of both devices. The aim of the present study is to evaluate and compare the efficacy of PTeye™ and FLUOBEAM® LX in identifying parathyroid adenomas.

Methods: Patients undergoing parathyroidectomy due to a parathyroid adenoma will be enrolled prospectively in this study and will be randomly included to Group A (PTeye™) or Group B (FLUOBEAM® LX). After intraoperative identification of parathyroid adenomas and before tissue dissection (minute 0), the efficacy of both devices to confirm the adenomas will be evaluated. Re-evaluation will take place in minutes 1, 3 and 5 during tissue dissection and before adenoma excision.

Inclusion Criteria:

- Patients with Primary parathyroidism with parathyroid adenoma

Exclusion Criteria:

• Parathyroid Hyperplasia,
• Secondary hyperparathyroidism

Patients with primary hyperparathyroidism and parathyroid adenoma, fulfilling the AAES guidelines indications for parathyroidectomy.

Upon request