Myotonia Congenita (Thomsen's Disease) and Hereditary Psychosis

In 1876 the Danish physician, Julius Thomas Thomsen, described the disease entity of myotonia congenita, from which he himself and some members of his family suffered. This muscular disorder is now accepted as a clinical and genetic entity, distinct from other forms of myotonia, viz. dystrophia myotonica and paramyotonia (De Jong, 1955).