INTRODUCTION

Myotonic dystrophy is a rare inherited neuromuscular disorder. It is usually classified into four types depending on when symptoms first appear: congenital, juvenile, adult, and late onset. Generally, the earlier the disease manifests itself, the more severe the symptoms.  There are two types of myotonic dystrophy: DM1 (type 1) and DM2 (type 2), which is also known as PROMM or proximal myotonic myopathia.