Myotonic dystrophy is an autosomal dominant disorder which is typically inherited from a person's parents.[1] There are two main types: type 1 (DM1), due to mutations in the DMPK gene, and type 2 (DM2), due to mutations in the CNBP gene.[1] The disorder generally worsens in each generation.[1] A type of DM1 may be apparent at birth.[1] DM2 is generally milder.[1] Diagnosis is confirmed by genetic testing.[2]