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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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.
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
The Parathyroid Glands00:59

The Parathyroid Glands

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.
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by producing...
Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Urinary Tract Calculi I: Introduction01:28

Urinary Tract Calculi I: Introduction

Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...

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Related Experiment Video

Updated: May 22, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
03:57

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Normocalcemic versus Hypercalcemic Primary Hyperparathyroidism: More Stone than Bone?

L M Amaral1, D C Queiroz, T F Marques

  • 1Division of Endocrinology and Diabetes, Agamenon Magalhães Hospital, Brazilian Ministry of Health (MS/SUS), University of Pernambuco Medical School, 52021-380 Recife, PE, Brazil.

Journal of Osteoporosis
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

Normocalcemic primary hyperparathyroidism (NPHPT) presents a high prevalence of kidney stones, similar to hypercalcemic forms. However, NPHPT patients showed preserved cortical bone, suggesting this condition requires management.

Related Experiment Videos

Last Updated: May 22, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
03:57

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Area of Science:

  • Endocrinology
  • Nephrology
  • Bone Metabolism

Background:

  • Normocalcemic primary hyperparathyroidism (NPHPT) is a variant of primary hyperparathyroidism (PHPT) with normal serum calcium.
  • NPHPT shares associations with renal stones and bone disorders, necessitating research into managing asymptomatic cases.

Purpose of the Study:

  • To compare clinical and laboratory data between normocalcemic and mild hypercalcemic forms of PHPT.
  • To investigate the prevalence of nephrolithiasis and bone fractures in NPHPT versus hypercalcemic PHPT.

Main Methods:

  • Retrospective evaluation of 70 patients diagnosed with PHPT.
  • Categorization of patients into normocalcemic (n=33) and mild hypercalcemic (n=37) groups.
  • Analysis of clinical data including history of renal stones and fractures.

Main Results:

  • Nephrolithiasis frequency was comparable: 18.2% in normocalcemic and 18.9% in hypercalcemic PHPT (P=0.937).
  • Fracture history was slightly higher in normocalcemic patients (15%) versus hypercalcemic (10.8%), but not statistically significant (P=0.726).
  • Normocalcemic PHPT patients demonstrated preservation of cortical bone.

Conclusions:

  • Normocalcemic primary hyperparathyroidism exhibits a high prevalence of urolithiasis.
  • Despite renal stone risk, cortical bone appears preserved in NPHPT.
  • These findings indicate NPHPT is a significant condition warranting treatment.