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[Myasthenia gravis associated with tonic pupil]
1Fourth Department of Medicine, Aichi Medical University.
Rinsho Shinkeigaku = Clinical Neurology
|August 1, 1990
Summary
A patient with myasthenia gravis (MG) and Adie's pupil experienced symptom improvement without immunosuppressants. This suggests autoimmune conditions may stem from shared autoantibodies, highlighting Adie's pupil's role.
Area of Science:
- Neurology
- Immunology
- Ophthalmology
Background:
- Acquired autoimmune myasthenia gravis (MG) is an neuromuscular disorder.
- Adie's pupil is a neurological disorder characterized by a tonic pupil.
- The co-occurrence of MG and Adie's pupil is rare, prompting investigation into potential shared etiologies.
Observation:
- A 41-year-old female presented with acquired autoimmune myasthenia gravis (MG, IIa type) and right-sided Adie's pupil.
- Diagnosis of MG coincided with the identification of Adie's pupil.
- A solitary thymoma was detected via imaging (pneumo-mediastinograph and CT scan).
Findings:
- Diagnostic tests including anti-nicotinic acetylcholine receptor (AChR) antibody titer, edrophonium test, and electrophysiological studies confirmed autoimmune MG associated with thymoma.
- Ophthalmic examinations revealed a postganglionic abnormality, primarily affecting the parasympathetic system, in response to various pharmacological agents and edrophonium.
- The patient's myasthenic and pupillary symptoms gradually improved spontaneously without immunosuppressive therapy or thymectomy.
Implications:
- The simultaneous presentation and subsequent improvement suggest a potential link between myasthenia gravis and Adie's pupil, possibly mediated by shared organ- or tissue-specific autoantibodies.
- This case underscores the importance of considering broader autoimmune mechanisms in neurological and ophthalmological disorders.
- The spontaneous resolution warrants further research into the pathogenesis and natural history of co-occurring MG and Adie's pupil.