A case of facioscapulohumeral muscular dystrophy and myasthenia gravis with positivity of anti-Ach receptor antibody: a fortuitous association?
Facioscapulohumeral dystrophy (FSHD) is the third most common form of muscular dystrophy (MD), after Duchenne muscular dystrophy and myotonic dystrophy, with a prevalence of approximately 1: 8.000–1:22.000 . It is inherited mostly as an autosomal dominant disease; however, up to 30% of cases are sporadic, arising from de novo mutations. FSHD symptoms typically develop in the second decade of life but can begin at any age from infancy to late adulthood . It presents clinically with asymmetric and slowly progressive weakness affecting the face, shoulder, and arms, followed by weakness of the distal lower extremities and pelvic girdle; typically, bulbar, extraocular, and respiratory muscles tend to be spared .
With an annual incidence of 8 to 10 cases per 1 million persons and a prevalence of 150 to 250 cases per 1 million, myasthenia gravis (MG) and its various subgroups are the major diseases that affect the neuromuscular junction. MG is an autoimmune disease in which...
KeywordsFSHD facioscapulohumeral muscular dystrophy MG myasthenia gravis AchR-abs antibodies to acetylcholine receptor RNS repetitive nerve stimulation SFEMG single-fiber elctromyography
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Conflict of interest
The authors declare that they have no conflicts of interest.
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