Suspected Adult-Onset Congenital Myasthenic Syndrome Associated With a Heterozygous CHRND Variant in a Patient With Seropositive Rheumatoid Arthritis: A Case Report

22 June 2026 : Case report Saudi Arabia

Challenging differential diagnosis, Congenital defects / diseases

Khaled Abdulwahab Amer

^{AE 1*}, Hanan Hassan Almalki

^{AF 2}, Faisal Saud Alhudaithi^{BD 3}

DOI: 10.12659/AJCR.952887

Am J Case Rep 2026; 27:e952887

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Table 2 Electrophysiological studies findings.

Investigation	Result	Interpretation
Nerve conduction study	Normal	No large-fiber polyneuropathy, entrapment, or demyelination
Repetitive nerve stimulation	Normal	No decremental or incremental responses
Electromyography	Normal	No evidence of myopathic or neuropathic changes

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