Schoen R T
Neurology. 1977 Jun;27(6):546-9. doi: 10.1212/wnl.27.6.546.
A 13-year-old girl demonstrated clinical, pharmacologic, and electromyographic evidence of myasthenia gravis, as well as clinical, electromyographic, and genetic evidence of myotonic dystrophy. Although myotonic dystrophy was documented in the family, no other family members were found to have myasthenia gravis.