Stiffness as a presenting symptom of an odd clinical condition caused by multiple sclerosis and myotonia congenita.

Abstract excerpt

A 24-year-old woman complained of a 4-year history of muscle cramps, stiffness of the right lower limb and walking difficulties. After clinical and laboratory investigations, a diagnosis of multiple sclerosis was made. However, her family history revealed that her father and an older sister had lifelong symptoms of impaired muscle relaxation following contraction, improving with physical exercise. Molecular...

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