Systemic lupus erythematosus, myasthenia gravis, and Ehlers-Danlos syndrome.

Clinical, electrophysiological, and laboratory data are reported on a 21-year-old black woman with systemic lupus erythematosus, myasthenia gravis, and Ehlers-Danlos syndrome. The first two diseases are related by similar pathogenetic mechanisms. To our knowledge, this is the first patient reported with this unusual combination of rare diseases.