Parathyroid detection in secondary hyperparathyroidism with 123I/99mTc-sestamibi subtraction single photon emission...

Area of Science:

• Nuclear Medicine
• Endocrinology
• Nephrology

Background:

• Secondary hyperparathyroidism is common in chronic renal failure.
• Parathyroidectomy is a treatment option for severe secondary hyperparathyroidism.
• Accurate preoperative localization of hyperplastic parathyroid glands is crucial for successful surgery.

Purpose of the Study:

• To evaluate the clinical usefulness of 123I/99mTc-sestamibi subtraction single photon emission computed tomography (SPECT) for preoperative parathyroid localization.
• To assess the sensitivity and factors influencing detection of hyperplastic parathyroid glands in patients with renal failure and secondary hyperparathyroidism.

Main Methods:

• Nineteen patients with chronic renal failure and secondary hyperparathyroidism underwent 123I/99mTc-sestamibi subtraction SPECT imaging.
• Parathyroid gland location, weight, and histopathology were recorded post-surgery.
• Surgical success was defined by gland resection.

Main Results:

• 123I/99mTc-sestamibi subtraction SPECT correctly identified 57 out of 74 (77%) hyperplastic parathyroid glands.
• True positive glands were significantly heavier (mean 1031 mg) than false negative glands (mean 465 mg) (P = 0.018).
• A weak positive correlation was found between parathyroid gland weight and SPECT detectability (Spearman correlation = 0.28; P = 0.0167).

Conclusions:

• 123I/99mTc-sestamibi subtraction SPECT is a useful tool for localizing hyperplastic parathyroid glands in patients with secondary hyperparathyroidism.
• The preoperative detection rate shows a weak relationship with anatomical parathyroid gland size.
• Further refinement may be needed to improve localization accuracy in all cases.