[PET with C-methionine and hyperparathyroidism]

Area of Science:

• Nuclear Medicine
• Endocrinology
• Radiology

Context:

• 99mTc-sestamibi scintigraphy and neck ultrasound are standard for locating parathyroid adenomas before parathyroidectomy.
• Persistent hyperparathyroidism occurs in 2-7% of patients post-surgery, often due to ectopic or missed parathyroid glands.
• The sensitivity of MIBI scintigraphy for ectopic glands is limited (30-80%), necessitating improved localization methods.

Purpose:

• To evaluate the diagnostic accuracy of PET with 11C-methionine in localizing persistent or ectopic parathyroid adenomas.
• To compare the efficacy of PET with 11C-methionine against MIBI scintigraphy in challenging hyperparathyroidism cases.
• To assess the utility of PET with 11C-methionine for secondary and tertiary hyperparathyroidism.

Summary:

• PET with 11C-methionine demonstrates high accuracy (91%) in locating parathyroid adenomas, outperforming MIBI scintigraphy in cases with persistent disease.
• This method successfully identified adenomas missed by MIBI scintigraphy in two presented cases of persistent hyperparathyroidism.
• PET with 11C-methionine facilitates focused parathyroidectomy, potentially reducing surgical invasiveness and improving aesthetic results.

Impact:

• PET with 11C-methionine offers a more accurate diagnostic tool for persistent hyperparathyroidism, enabling targeted surgical intervention.
• Improved localization can lead to less invasive surgeries, reduced postoperative pain, and better cosmetic outcomes.
• Despite limitations like tracer availability and high cost, this technique holds significant clinical value for complex hyperparathyroidism cases.