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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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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.
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Bone Marrow Sampling and Transplants01:22

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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
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Bone Remodeling01:40

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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.
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Osteoclasts in Bone Remodeling01:31

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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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The Functions of the Skeletal System01:22

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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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Axial Skeleton Bone Marrow Changes in Inflammatory Rheumatologic Disorders.

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Magnetic resonance imaging (MRI) is key for diagnosing inflammatory rheumatologic disorders like axial spondyloarthritis. Understanding specific MRI findings aids early diagnosis and treatment, preventing misdiagnosis and unnecessary biopsies.

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Area of Science:

  • Radiology
  • Rheumatology
  • Medical Imaging

Background:

  • Magnetic resonance imaging (MRI) is crucial for diagnosing inflammatory rheumatologic conditions affecting the axial skeleton, spine, and sacroiliac (SI) joints.
  • Conditions include axial spondyloarthritis, rheumatoid arthritis, and SAPHO/CRMO (synovitis, acne, pustulosis, hyperostosis, and osteitis/chronic recurrent multifocal osteomyelitis).

Purpose of the Study:

  • To highlight the importance of disease-specific knowledge in interpreting MRI findings for rheumatologic disorders.
  • To guide radiologists in utilizing specific MRI parameters for early and accurate diagnosis.

Main Methods:

  • Review of MRI findings in inflammatory rheumatologic disorders.
  • Discussion of key imaging hallmarks and their diagnostic significance.
  • Consideration of clinical context (age, sex, history) for accurate interpretation.

Main Results:

  • Bone marrow edema-like signal is a common finding but not disease-specific.
  • Specific MRI parameters can aid in early diagnosis and treatment planning.
  • Awareness of diagnostic hallmarks helps avoid misdiagnosis and unnecessary biopsies.

Conclusions:

  • Accurate MRI interpretation requires disease-specific knowledge and consideration of clinical factors.
  • Early diagnosis through tailored MRI analysis leads to effective treatment for inflammatory rheumatologic diseases.
  • Whole-body MRI may be beneficial for diagnosing SAPHO/CRMO.