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The Parathyroid Glands00:59

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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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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Updated: Mar 21, 2026

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PET and Parathyroid.

Gaia Grassetto1, Abass Alavi2, Domenico Rubello1

  • 1Department of Nuclear Medicine, PET Center, 'S. Maria della Misercordia' Rovigo Hospital, Istituto Oncologico Veneto (IOV)-IRCCS, Viale Tre Martiri 140, 45100 Rovigo, Italy.

PET Clinics
|May 10, 2016
PubMed
Summary
This summary is machine-generated.

Classical scintigraphy is the primary method for locating hyperactive parathyroid glands. When this fails, (11)C-methionine imaging offers a viable alternative for parathyroid disease localization.

Keywords:
(11)C-methionine(99m)Tc-SestamibiHyperparathyroidismPET/CT imaging

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Area of Science:

  • Nuclear medicine
  • Endocrinology
  • Medical imaging

Background:

  • Parathyroid disease diagnosis relies heavily on accurate localization of hyperfunctional glands.
  • Classical scintigraphic techniques are established first-line methods for parathyroid localization.
  • Challenges arise when conventional methods are inconclusive.

Purpose of the Study:

  • To evaluate the utility of (11)C-methionine as an alternative imaging modality for parathyroid localization.
  • To assess the effectiveness of (11)C-methionine when standard scintigraphy is non-diagnostic.

Main Methods:

  • Review of cases where classical scintigraphy was insufficient for parathyroid localization.
  • Analysis of the diagnostic performance of (11)C-methionine in these challenging cases.
  • Comparison of imaging findings with histopathological confirmation where available.

Main Results:

  • Classical scintigraphy is the initial diagnostic tool for various forms of hyperparathyroidism.
  • (11)C-methionine demonstrated effectiveness as a secondary imaging option.
  • This alternative imaging approach aids in localizing elusive hyperfunctional parathyroid glands.

Conclusions:

  • Classical scintigraphy remains the gold standard for initial parathyroid gland localization.
  • (11)C-methionine serves as a valuable alternative when conventional methods fail.
  • Improved localization strategies enhance the management of complex parathyroid disorders.