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Related Concept Videos

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...
Poliomyelitis01:17

Poliomyelitis

Poliomyelitis is caused by poliovirus, a small, non-enveloped, positive-sense RNA virus of the Picornaviridae family and Enterovirus genus. Transmission occurs primarily via the fecal-oral route, often through ingestion of contaminated water or food. The virus initially replicates in the oropharynx and intestinal mucosa, particularly in lymphoid tissues such as the tonsils, Peyer’s patches, and regional lymph nodes. Primary viremia follows, allowing dissemination throughout the body.In most...
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...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
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...

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Related Experiment Video

Updated: Jun 24, 2026

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
06:15

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

Published on: September 7, 2018

[Polymyositis associated with thymoma].

B Jordan1, K Eger, S Zierz

  • 1Klinik und Poliklinik für Neurologie, Martin-Luther-Universität Halle-Wittenberg, Ernst-Grube-Strasse 40, 06097, Halle/Saale, Deutschland. Berit.Jordan@medizin.uni-halle.de

Der Nervenarzt
|April 7, 2009
PubMed
Summary
This summary is machine-generated.

Thymoma can co-occur with neuromuscular disorders like myasthenia gravis and polymyositis. This case highlights diagnostic challenges when these paraneoplastic syndromes present simultaneously.

Related Experiment Videos

Last Updated: Jun 24, 2026

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
06:15

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

Published on: September 7, 2018

Area of Science:

  • Neurology
  • Oncology
  • Immunology

Background:

  • Thymoma, a tumor of the thymus, is frequently associated with paraneoplastic neuromuscular disorders.
  • Myasthenia gravis (MG) is the most common, affecting up to 50% of thymoma patients.
  • Polymyositis and dermatomyositis are less common paraneoplastic manifestations, occurring in approximately 5% of cases.

Observation:

  • This report details a patient with thymoma presenting with both myasthenia gravis and polymyositis.
  • The simultaneous occurrence of these conditions created diagnostic overlap.
  • Diagnostic criteria, including serum creatine kinase levels, electromyography (EMG), and ocular findings, were complicated by the dual presentation.

Findings:

  • The co-occurrence of myasthenia gravis and polymyositis in a single thymoma patient is rare.
  • Diagnostic ambiguity arose due to overlapping clinical and electrophysiological features.
  • This diagnostic dilemma complicated the selection of an appropriate therapeutic strategy.

Implications:

  • Simultaneous paraneoplastic neuromuscular diseases in thymoma necessitate careful diagnostic evaluation.
  • Clinicians must consider overlapping diagnostic criteria when faced with complex presentations.
  • Effective management requires a nuanced approach to address both the thymoma and its associated neuromuscular complications.