Myotonic dystrophy
（重定向自Myotonic muscular dystrophy）
![](/Images/godic/202501/28/Myotonic_dystrophy_patient2212.JPG")
![Myotonic dystrophy is inherited in an autosomal dominant pattern.](/Images/godic/202501/28/Autosomal_dominant_-_en.svg2212.png")
![Histopathology of DM2. Muscle biopsy showing mild myopathic changes and grouping of atrophic fast fibres (type 2, highlighted). Immunohistochemical staining for type-1 (](/Images/godic/202501/28/DM2_Histopathology2212.jpg")
Myotonic dystrophy (dystrophia myotonica, myotonia atrophica) is a chronic, slowly progressing, highly variable, inherited multisystemic disease. It is an autosomal-dominant disease.It is characterized by wasting of the muscles (muscular dystrophy), cataracts, heart conduction defects, endocrine changes, and myotonia.