Myotonic dystrophy type 2: theories of pathogenesis and clinical diagnostic criteria (description of two clinical cases)

Myotonic dystrophy type 2 is an autosomal dominant neuromuscular disease characterised by slowly progressive muscle weakness and difficulty in muscle relaxation after contraction (myotonia). The disease has a significant impact on the psychological well-being, economic status and overall quality of life of patients. Two clinical cases of myotonic dystrophy type 2 are considered. It is noted that myalgia is the main symptom reducing the quality of life.