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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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Retropharyngeal Parathyroid Glands: Important Differences.

James W Gallagher1, Meghan L Kelley2, Linwah Yip2

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|October 1, 2017
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Summary

Retropharyngeal (RP) parathyroid glands occur in 1.6% of primary hyperparathyroidism (PHPT) cases, are more common during reoperation, and are linked to initial surgical failure. Imaging often fails to detect these ectopic glands, necessitating careful exploration.

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Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Anatomy

Background:

  • Primary hyperparathyroidism (PHPT) involves parathyroid gland overactivity.
  • Ectopic parathyroid glands, particularly retropharyngeal (RP) glands, can complicate PHPT surgery.
  • Understanding the prevalence and characteristics of RP glands is crucial for surgical success.

Purpose of the Study:

  • To determine the incidence and features of retropharyngeal (RP) parathyroid glands in patients with sporadic PHPT.
  • To compare characteristics of patients with RP glands versus those with normally positioned glands.

Main Methods:

  • Prospective database analysis of sporadic PHPT surgeries from 1997 to 2016.
  • Comparison of patients with RP glands to those with normally positioned hyperfunctioning parathyroids.
  • Analysis of preoperative imaging (ultrasound, 99mTc-sestamibi) and intraoperative PTH levels.

Main Results:

  • RP glands were found in 1.6% of patients (47/3006), being more frequent in reoperative cases (5.5% vs 1.4%).
  • RP patients had a higher rate of prior failed surgery (17% vs 3.1%).
  • Imaging showed high rates of negative findings; ultrasound was negative in all but one case, and 99mTc-sestamibi was positive in only 28% of RP cases.

Conclusions:

  • Hyperfunctioning RP glands occur in 1.6% of PHPT cases and are associated with initial surgical failure.
  • RP ectopia is significantly more common during reoperation.
  • Despite high rates of negative imaging, findings suggestive of midline abnormalities can guide exploration; the RP space should be considered in difficult cases.