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Related Concept Videos

Myasthenia Gravis: Diagnostic Tests01:15

Myasthenia Gravis: Diagnostic Tests

Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...

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Related Experiment Video

Updated: Jun 3, 2026

Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models
08:57

Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models

Published on: May 17, 2024

Paraneoplastic muscle disease.

Alan N Baer1

  • 1Division of Rheumatology, Johns Hopkins University School of Medicine, Good Samaritan Hospital, 5200 Eastern Avenue, Mason F. Lord Building Center Tower, Suite 4100, Room 413, Baltimore MD 21224, USA. alanbaer@jhmi.edu

Rheumatic Diseases Clinics of North America
|March 30, 2011
PubMed
Summary
This summary is machine-generated.

Paraneoplastic muscle diseases, often autoimmune, can signal underlying cancer. Early diagnosis of these inflammatory myopathies and neuromuscular disorders is crucial for detecting malignancy.

Related Experiment Videos

Last Updated: Jun 3, 2026

Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models
08:57

Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models

Published on: May 17, 2024

Area of Science:

  • Neurology
  • Oncology
  • Immunology

Background:

  • Paraneoplastic muscle diseases involve remote effects of malignancy on neuromuscular function.
  • Autoimmunity is a key factor in many paraneoplastic myopathies.
  • These conditions can be the initial sign of an occult cancer.

Purpose of the Study:

  • To review inflammatory and necrotizing myopathies associated with malignancy.
  • To discuss neuromuscular transmission disorders as paraneoplastic phenomena.
  • To emphasize the importance of searching for underlying tumors in these patients.

Main Methods:

  • Literature review of paraneoplastic neurological disorders.
  • Focus on inflammatory myopathies, necrotizing myopathies, and neuromuscular junction disorders.
  • Clinical case analysis and diagnostic considerations.

Main Results:

  • Paraneoplastic myopathies present with inflammation or necrosis.
  • Autoimmune mechanisms are frequently implicated.
  • Neuromuscular transmission defects can occur.
  • Diagnosis necessitates a thorough oncological workup.

Conclusions:

  • Paraneoplastic muscle diseases require prompt recognition and investigation for underlying malignancy.
  • Understanding the autoimmune basis aids in diagnosis and management.
  • Vigilance for cancer is paramount when these neurological signs appear.